We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Deprecation: `imghdr` module is being deprecated in Python 3.11
The `imghdr` module is being deprected in `3.11` and will be removed in `3.13`. See [PEP 594](https://peps.python.org/pep-0594/#imghdr) for details. 

We currently use it only in one area: https://github.com/python-telegram-bot/python-telegram-bot/blob/be8f4f7aad9c3ded333950d00ecde57dbdda59c2/telegram/_files/inputfile.py#L108

Alternatives would be:
1. Just use the `mimetype` module? We were using only the `mimetype` module until [@b83a659](https://github.com/python-telegram-bot/python-telegram-bot/commit/b83a659) where we used a 'hack' to detect the type from the byte stream. This was then [replaced](https://github.com/python-telegram-bot/python-telegram-bot/commit/5dc1e4cac19cdd34d7cad4688afa0277a0c8a436) by the `imghdr` module which did the same thing better.
2. Use a library called [filetype](https://github.com/h2non/filetype.py) to detect images. This was [recommended](https://peps.python.org/pep-0594/#deprecated-modules) by the PEP.
3. Just copy the python [source](https://github.com/python/cpython/blob/3.11/Lib/imghdr.py) of the `imghdr` module into ours?

 

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `telegram/_files/inputfile.py`
Content:
```
1 #!/usr/bin/env python
2 #
3 # A library that provides a Python interface to the Telegram Bot API
4 # Copyright (C) 2015-2022
5 # Leandro Toledo de Souza <devs@python-telegram-bot.org>
6 #
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU Lesser Public License as published by
9 # the Free Software Foundation, either version 3 of the License, or
10 # (at your option) any later version.
11 #
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 # GNU Lesser Public License for more details.
16 #
17 # You should have received a copy of the GNU Lesser Public License
18 # along with this program.  If not, see [http://www.gnu.org/licenses/].
19 """This module contains an object that represents a Telegram InputFile."""
20 
21 import imghdr
22 import logging
23 import mimetypes
24 from pathlib import Path
25 from typing import IO, Optional, Union
26 from uuid import uuid4
27 
28 from telegram._utils.types import FieldTuple
29 
30 _DEFAULT_MIME_TYPE = "application/octet-stream"
31 logger = logging.getLogger(__name__)
32 
33 
34 class InputFile:
35     """This object represents a Telegram InputFile.
36 
37     .. versionchanged:: 20.0
38         The former attribute ``attach`` was renamed to :attr:`attach_name`.
39 
40     Args:
41         obj (:term:`file object` | :obj:`bytes` | :obj:`str`): An open file descriptor or the files
42             content as bytes or string.
43 
44             Note:
45                 If :paramref:`obj` is a string, it will be encoded as bytes via
46                 :external:obj:`obj.encode('utf-8') <str.encode>`.
47 
48             .. versionchanged:: 20.0
49                 Accept string input.
50         filename (:obj:`str`, optional): Filename for this InputFile.
51         attach (:obj:`bool`, optional): Pass :obj:`True` if the parameter this file belongs to in
52             the request to Telegram should point to the multipart data via an ``attach://`` URI.
53             Defaults to `False`.
54 
55     Attributes:
56         input_file_content (:obj:`bytes`): The binary content of the file to send.
57         attach_name (:obj:`str`): Optional. If present, the parameter this file belongs to in
58             the request to Telegram should point to the multipart data via a an URI of the form
59             ``attach://<attach_name>`` URI.
60         filename (:obj:`str`): Filename for the file to be sent.
61         mimetype (:obj:`str`): The mimetype inferred from the file to be sent.
62 
63     """
64 
65     __slots__ = ("filename", "attach_name", "input_file_content", "mimetype")
66 
67     def __init__(
68         self, obj: Union[IO[bytes], bytes, str], filename: str = None, attach: bool = False
69     ):
70         if isinstance(obj, bytes):
71             self.input_file_content = obj
72         elif isinstance(obj, str):
73             self.input_file_content = obj.encode("utf-8")
74         else:
75             self.input_file_content = obj.read()
76         self.attach_name: Optional[str] = "attached" + uuid4().hex if attach else None
77 
78         if (
79             not filename
80             and hasattr(obj, "name")
81             and not isinstance(obj.name, int)  # type: ignore[union-attr]
82         ):
83             filename = Path(obj.name).name  # type: ignore[union-attr]
84 
85         image_mime_type = self.is_image(self.input_file_content)
86         if image_mime_type:
87             self.mimetype = image_mime_type
88         elif filename:
89             self.mimetype = mimetypes.guess_type(filename)[0] or _DEFAULT_MIME_TYPE
90         else:
91             self.mimetype = _DEFAULT_MIME_TYPE
92 
93         self.filename = filename or self.mimetype.replace("/", ".")
94 
95     @staticmethod
96     def is_image(stream: bytes) -> Optional[str]:
97         """Check if the content file is an image by analyzing its headers.
98 
99         Args:
100             stream (:obj:`bytes`): A byte stream representing the content of a file.
101 
102         Returns:
103             :obj:`str` | :obj:`None`: The mime-type of an image, if the input is an image, or
104             :obj:`None` else.
105 
106         """
107         try:
108             image = imghdr.what(None, stream)
109             if image:
110                 return f"image/{image}"
111             return None
112         except Exception:
113             logger.debug(
114                 "Could not parse file content. Assuming that file is not an image.", exc_info=True
115             )
116             return None
117 
118     @property
119     def field_tuple(self) -> FieldTuple:
120         """Field tuple representing the contents of the file for upload to the Telegram servers.
121 
122         Returns:
123             Tuple[:obj:`str`, :obj:`bytes`, :obj:`str`]:
124         """
125         return self.filename, self.input_file_content, self.mimetype
126 
127     @property
128     def attach_uri(self) -> Optional[str]:
129         """URI to insert into the JSON data for uploading the file. Returns :obj:`None`, if
130         :attr:`attach_name` is :obj:`None`.
131         """
132         return f"attach://{self.attach_name}" if self.attach_name else None
133
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/telegram/_files/inputfile.py b/telegram/_files/inputfile.py
--- a/telegram/_files/inputfile.py
+++ b/telegram/_files/inputfile.py
@@ -18,7 +18,6 @@
 # along with this program.  If not, see [http://www.gnu.org/licenses/].
 """This module contains an object that represents a Telegram InputFile."""
 
-import imghdr
 import logging
 import mimetypes
 from pathlib import Path
@@ -35,7 +34,11 @@
     """This object represents a Telegram InputFile.
 
     .. versionchanged:: 20.0
-        The former attribute ``attach`` was renamed to :attr:`attach_name`.
+
+        * The former attribute ``attach`` was renamed to :attr:`attach_name`.
+        * Method ``is_image`` was removed. If you pass :obj:`bytes` to :paramref:`obj` and would
+          like to have the mime type automatically guessed, please pass :paramref:`filename`
+          in addition.
 
     Args:
         obj (:term:`file object` | :obj:`bytes` | :obj:`str`): An open file descriptor or the files
@@ -82,39 +85,13 @@
         ):
             filename = Path(obj.name).name  # type: ignore[union-attr]
 
-        image_mime_type = self.is_image(self.input_file_content)
-        if image_mime_type:
-            self.mimetype = image_mime_type
-        elif filename:
-            self.mimetype = mimetypes.guess_type(filename)[0] or _DEFAULT_MIME_TYPE
+        if filename:
+            self.mimetype = mimetypes.guess_type(filename, strict=False)[0] or _DEFAULT_MIME_TYPE
         else:
             self.mimetype = _DEFAULT_MIME_TYPE
 
         self.filename = filename or self.mimetype.replace("/", ".")
 
-    @staticmethod
-    def is_image(stream: bytes) -> Optional[str]:
-        """Check if the content file is an image by analyzing its headers.
-
-        Args:
-            stream (:obj:`bytes`): A byte stream representing the content of a file.
-
-        Returns:
-            :obj:`str` | :obj:`None`: The mime-type of an image, if the input is an image, or
-            :obj:`None` else.
-
-        """
-        try:
-            image = imghdr.what(None, stream)
-            if image:
-                return f"image/{image}"
-            return None
-        except Exception:
-            logger.debug(
-                "Could not parse file content. Assuming that file is not an image.", exc_info=True
-            )
-            return None
-
     @property
     def field_tuple(self) -> FieldTuple:
         """Field tuple representing the contents of the file for upload to the Telegram servers.

{"golden_diff": "diff --git a/telegram/_files/inputfile.py b/telegram/_files/inputfile.py\n--- a/telegram/_files/inputfile.py\n+++ b/telegram/_files/inputfile.py\n@@ -18,7 +18,6 @@\n # along with this program.  If not, see [http://www.gnu.org/licenses/].\n \"\"\"This module contains an object that represents a Telegram InputFile.\"\"\"\n \n-import imghdr\n import logging\n import mimetypes\n from pathlib import Path\n@@ -35,7 +34,11 @@\n     \"\"\"This object represents a Telegram InputFile.\n \n     .. versionchanged:: 20.0\n-        The former attribute ``attach`` was renamed to :attr:`attach_name`.\n+\n+        * The former attribute ``attach`` was renamed to :attr:`attach_name`.\n+        * Method ``is_image`` was removed. If you pass :obj:`bytes` to :paramref:`obj` and would\n+          like to have the mime type automatically guessed, please pass :paramref:`filename`\n+          in addition.\n \n     Args:\n         obj (:term:`file object` | :obj:`bytes` | :obj:`str`): An open file descriptor or the files\n@@ -82,39 +85,13 @@\n         ):\n             filename = Path(obj.name).name  # type: ignore[union-attr]\n \n-        image_mime_type = self.is_image(self.input_file_content)\n-        if image_mime_type:\n-            self.mimetype = image_mime_type\n-        elif filename:\n-            self.mimetype = mimetypes.guess_type(filename)[0] or _DEFAULT_MIME_TYPE\n+        if filename:\n+            self.mimetype = mimetypes.guess_type(filename, strict=False)[0] or _DEFAULT_MIME_TYPE\n         else:\n             self.mimetype = _DEFAULT_MIME_TYPE\n \n         self.filename = filename or self.mimetype.replace(\"/\", \".\")\n \n-    @staticmethod\n-    def is_image(stream: bytes) -> Optional[str]:\n-        \"\"\"Check if the content file is an image by analyzing its headers.\n-\n-        Args:\n-            stream (:obj:`bytes`): A byte stream representing the content of a file.\n-\n-        Returns:\n-            :obj:`str` | :obj:`None`: The mime-type of an image, if the input is an image, or\n-            :obj:`None` else.\n-\n-        \"\"\"\n-        try:\n-            image = imghdr.what(None, stream)\n-            if image:\n-                return f\"image/{image}\"\n-            return None\n-        except Exception:\n-            logger.debug(\n-                \"Could not parse file content. Assuming that file is not an image.\", exc_info=True\n-            )\n-            return None\n-\n     @property\n     def field_tuple(self) -> FieldTuple:\n         \"\"\"Field tuple representing the contents of the file for upload to the Telegram servers.\n", "issue": "Deprecation: `imghdr` module is being deprecated in Python 3.11\nThe `imghdr` module is being deprected in `3.11` and will be removed in `3.13`. See [PEP 594](https://peps.python.org/pep-0594/#imghdr) for details. \r\n\r\nWe currently use it only in one area: https://github.com/python-telegram-bot/python-telegram-bot/blob/be8f4f7aad9c3ded333950d00ecde57dbdda59c2/telegram/_files/inputfile.py#L108\r\n\r\nAlternatives would be:\r\n1. Just use the `mimetype` module? We were using only the `mimetype` module until [@b83a659](https://github.com/python-telegram-bot/python-telegram-bot/commit/b83a659) where we used a 'hack' to detect the type from the byte stream. This was then [replaced](https://github.com/python-telegram-bot/python-telegram-bot/commit/5dc1e4cac19cdd34d7cad4688afa0277a0c8a436) by the `imghdr` module which did the same thing better.\r\n2. Use a library called [filetype](https://github.com/h2non/filetype.py) to detect images. This was [recommended](https://peps.python.org/pep-0594/#deprecated-modules) by the PEP.\r\n3. Just copy the python [source](https://github.com/python/cpython/blob/3.11/Lib/imghdr.py) of the `imghdr` module into ours?\r\n\r\n \n", "before_files": [{"content": "#!/usr/bin/env python\n#\n# A library that provides a Python interface to the Telegram Bot API\n# Copyright (C) 2015-2022\n# Leandro Toledo de Souza <devs@python-telegram-bot.org>\n#\n# This program is free software: you can redistribute it and/or modify\n# it under the terms of the GNU Lesser Public License as published by\n# the Free Software Foundation, either version 3 of the License, or\n# (at your option) any later version.\n#\n# This program is distributed in the hope that it will be useful,\n# but WITHOUT ANY WARRANTY; without even the implied warranty of\n# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n# GNU Lesser Public License for more details.\n#\n# You should have received a copy of the GNU Lesser Public License\n# along with this program.  If not, see [http://www.gnu.org/licenses/].\n\"\"\"This module contains an object that represents a Telegram InputFile.\"\"\"\n\nimport imghdr\nimport logging\nimport mimetypes\nfrom pathlib import Path\nfrom typing import IO, Optional, Union\nfrom uuid import uuid4\n\nfrom telegram._utils.types import FieldTuple\n\n_DEFAULT_MIME_TYPE = \"application/octet-stream\"\nlogger = logging.getLogger(__name__)\n\n\nclass InputFile:\n    \"\"\"This object represents a Telegram InputFile.\n\n    .. versionchanged:: 20.0\n        The former attribute ``attach`` was renamed to :attr:`attach_name`.\n\n    Args:\n        obj (:term:`file object` | :obj:`bytes` | :obj:`str`): An open file descriptor or the files\n            content as bytes or string.\n\n            Note:\n                If :paramref:`obj` is a string, it will be encoded as bytes via\n                :external:obj:`obj.encode('utf-8') <str.encode>`.\n\n            .. versionchanged:: 20.0\n                Accept string input.\n        filename (:obj:`str`, optional): Filename for this InputFile.\n        attach (:obj:`bool`, optional): Pass :obj:`True` if the parameter this file belongs to in\n            the request to Telegram should point to the multipart data via an ``attach://`` URI.\n            Defaults to `False`.\n\n    Attributes:\n        input_file_content (:obj:`bytes`): The binary content of the file to send.\n        attach_name (:obj:`str`): Optional. If present, the parameter this file belongs to in\n            the request to Telegram should point to the multipart data via a an URI of the form\n            ``attach://<attach_name>`` URI.\n        filename (:obj:`str`): Filename for the file to be sent.\n        mimetype (:obj:`str`): The mimetype inferred from the file to be sent.\n\n    \"\"\"\n\n    __slots__ = (\"filename\", \"attach_name\", \"input_file_content\", \"mimetype\")\n\n    def __init__(\n        self, obj: Union[IO[bytes], bytes, str], filename: str = None, attach: bool = False\n    ):\n        if isinstance(obj, bytes):\n            self.input_file_content = obj\n        elif isinstance(obj, str):\n            self.input_file_content = obj.encode(\"utf-8\")\n        else:\n            self.input_file_content = obj.read()\n        self.attach_name: Optional[str] = \"attached\" + uuid4().hex if attach else None\n\n        if (\n            not filename\n            and hasattr(obj, \"name\")\n            and not isinstance(obj.name, int)  # type: ignore[union-attr]\n        ):\n            filename = Path(obj.name).name  # type: ignore[union-attr]\n\n        image_mime_type = self.is_image(self.input_file_content)\n        if image_mime_type:\n            self.mimetype = image_mime_type\n        elif filename:\n            self.mimetype = mimetypes.guess_type(filename)[0] or _DEFAULT_MIME_TYPE\n        else:\n            self.mimetype = _DEFAULT_MIME_TYPE\n\n        self.filename = filename or self.mimetype.replace(\"/\", \".\")\n\n    @staticmethod\n    def is_image(stream: bytes) -> Optional[str]:\n        \"\"\"Check if the content file is an image by analyzing its headers.\n\n        Args:\n            stream (:obj:`bytes`): A byte stream representing the content of a file.\n\n        Returns:\n            :obj:`str` | :obj:`None`: The mime-type of an image, if the input is an image, or\n            :obj:`None` else.\n\n        \"\"\"\n        try:\n            image = imghdr.what(None, stream)\n            if image:\n                return f\"image/{image}\"\n            return None\n        except Exception:\n            logger.debug(\n                \"Could not parse file content. Assuming that file is not an image.\", exc_info=True\n            )\n            return None\n\n    @property\n    def field_tuple(self) -> FieldTuple:\n        \"\"\"Field tuple representing the contents of the file for upload to the Telegram servers.\n\n        Returns:\n            Tuple[:obj:`str`, :obj:`bytes`, :obj:`str`]:\n        \"\"\"\n        return self.filename, self.input_file_content, self.mimetype\n\n    @property\n    def attach_uri(self) -> Optional[str]:\n        \"\"\"URI to insert into the JSON data for uploading the file. Returns :obj:`None`, if\n        :attr:`attach_name` is :obj:`None`.\n        \"\"\"\n        return f\"attach://{self.attach_name}\" if self.attach_name else None\n", "path": "telegram/_files/inputfile.py"}], "after_files": [{"content": "#!/usr/bin/env python\n#\n# A library that provides a Python interface to the Telegram Bot API\n# Copyright (C) 2015-2022\n# Leandro Toledo de Souza <devs@python-telegram-bot.org>\n#\n# This program is free software: you can redistribute it and/or modify\n# it under the terms of the GNU Lesser Public License as published by\n# the Free Software Foundation, either version 3 of the License, or\n# (at your option) any later version.\n#\n# This program is distributed in the hope that it will be useful,\n# but WITHOUT ANY WARRANTY; without even the implied warranty of\n# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n# GNU Lesser Public License for more details.\n#\n# You should have received a copy of the GNU Lesser Public License\n# along with this program.  If not, see [http://www.gnu.org/licenses/].\n\"\"\"This module contains an object that represents a Telegram InputFile.\"\"\"\n\nimport logging\nimport mimetypes\nfrom pathlib import Path\nfrom typing import IO, Optional, Union\nfrom uuid import uuid4\n\nfrom telegram._utils.types import FieldTuple\n\n_DEFAULT_MIME_TYPE = \"application/octet-stream\"\nlogger = logging.getLogger(__name__)\n\n\nclass InputFile:\n    \"\"\"This object represents a Telegram InputFile.\n\n    .. versionchanged:: 20.0\n\n        * The former attribute ``attach`` was renamed to :attr:`attach_name`.\n        * Method ``is_image`` was removed. If you pass :obj:`bytes` to :paramref:`obj` and would\n          like to have the mime type automatically guessed, please pass :paramref:`filename`\n          in addition.\n\n    Args:\n        obj (:term:`file object` | :obj:`bytes` | :obj:`str`): An open file descriptor or the files\n            content as bytes or string.\n\n            Note:\n                If :paramref:`obj` is a string, it will be encoded as bytes via\n                :external:obj:`obj.encode('utf-8') <str.encode>`.\n\n            .. versionchanged:: 20.0\n                Accept string input.\n        filename (:obj:`str`, optional): Filename for this InputFile.\n        attach (:obj:`bool`, optional): Pass :obj:`True` if the parameter this file belongs to in\n            the request to Telegram should point to the multipart data via an ``attach://`` URI.\n            Defaults to `False`.\n\n    Attributes:\n        input_file_content (:obj:`bytes`): The binary content of the file to send.\n        attach_name (:obj:`str`): Optional. If present, the parameter this file belongs to in\n            the request to Telegram should point to the multipart data via a an URI of the form\n            ``attach://<attach_name>`` URI.\n        filename (:obj:`str`): Filename for the file to be sent.\n        mimetype (:obj:`str`): The mimetype inferred from the file to be sent.\n\n    \"\"\"\n\n    __slots__ = (\"filename\", \"attach_name\", \"input_file_content\", \"mimetype\")\n\n    def __init__(\n        self, obj: Union[IO[bytes], bytes, str], filename: str = None, attach: bool = False\n    ):\n        if isinstance(obj, bytes):\n            self.input_file_content = obj\n        elif isinstance(obj, str):\n            self.input_file_content = obj.encode(\"utf-8\")\n        else:\n            self.input_file_content = obj.read()\n        self.attach_name: Optional[str] = \"attached\" + uuid4().hex if attach else None\n\n        if (\n            not filename\n            and hasattr(obj, \"name\")\n            and not isinstance(obj.name, int)  # type: ignore[union-attr]\n        ):\n            filename = Path(obj.name).name  # type: ignore[union-attr]\n\n        if filename:\n            self.mimetype = mimetypes.guess_type(filename, strict=False)[0] or _DEFAULT_MIME_TYPE\n        else:\n            self.mimetype = _DEFAULT_MIME_TYPE\n\n        self.filename = filename or self.mimetype.replace(\"/\", \".\")\n\n    @property\n    def field_tuple(self) -> FieldTuple:\n        \"\"\"Field tuple representing the contents of the file for upload to the Telegram servers.\n\n        Returns:\n            Tuple[:obj:`str`, :obj:`bytes`, :obj:`str`]:\n        \"\"\"\n        return self.filename, self.input_file_content, self.mimetype\n\n    @property\n    def attach_uri(self) -> Optional[str]:\n        \"\"\"URI to insert into the JSON data for uploading the file. Returns :obj:`None`, if\n        :attr:`attach_name` is :obj:`None`.\n        \"\"\"\n        return f\"attach://{self.attach_name}\" if self.attach_name else None\n", "path": "telegram/_files/inputfile.py"}]}