We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
new cachetools version (5.0.0+) can't work with google-auth
`cachetools` has released a new version (5.0.0) which conflicts with google-auth requirements of it being <5, this prevents updates to the `cachetools` package and pose a potential security concern (as updates are no longer possible to it)

```
The conflict is caused by:
    The user requested cachetools==5.0.0
    google-auth 2.3.3 depends on cachetools<5.0 and >=2.0.0
```

issue seems in https://github.com/googleapis/google-auth-library-python/blob/3c3fbf40b07e090f2be7fac5b304dbf438b5cd6c/setup.py#L23 

#### Environment details

  - OS: alpine3.11
  - Python version: python:3.8.6
  - pip version: 20.3.3
  - `google-auth` version: 2.3.3 (latest at time of writing)

#### Steps to reproduce

  1. try pip install using latest `cachetools` with latest `google-auth`
  2. pip fails


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `setup.py`
Content:
```
1 # Copyright 2014 Google Inc.
2 #
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
6 #
7 #      http://www.apache.org/licenses/LICENSE-2.0
8 #
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
14 
15 import io
16 import os
17 
18 from setuptools import find_packages
19 from setuptools import setup
20 
21 
22 DEPENDENCIES = (
23     "cachetools>=2.0.0,<5.0",
24     "pyasn1-modules>=0.2.1",
25     # rsa==4.5 is the last version to support 2.7
26     # https://github.com/sybrenstuvel/python-rsa/issues/152#issuecomment-643470233
27     'rsa<4.6; python_version < "3.6"',
28     'rsa>=3.1.4,<5; python_version >= "3.6"',
29     # install enum34 to support 2.7. enum34 only works up to python version 3.3.
30     'enum34>=1.1.10; python_version < "3.4"',
31     "six>=1.9.0",
32 )
33 
34 extras = {
35     "aiohttp": [
36         "aiohttp >= 3.6.2, < 4.0.0dev; python_version>='3.6'",
37         "requests >= 2.20.0, < 3.0.0dev",
38     ],
39     "pyopenssl": "pyopenssl>=20.0.0",
40     "reauth": "pyu2f>=0.1.5",
41 }
42 
43 with io.open("README.rst", "r") as fh:
44     long_description = fh.read()
45 
46 package_root = os.path.abspath(os.path.dirname(__file__))
47 
48 version = {}
49 with open(os.path.join(package_root, "google/auth/version.py")) as fp:
50     exec(fp.read(), version)
51 version = version["__version__"]
52 
53 setup(
54     name="google-auth",
55     version=version,
56     author="Google Cloud Platform",
57     author_email="googleapis-packages@google.com",
58     description="Google Authentication Library",
59     long_description=long_description,
60     url="https://github.com/googleapis/google-auth-library-python",
61     packages=find_packages(exclude=("tests*", "system_tests*")),
62     namespace_packages=("google",),
63     install_requires=DEPENDENCIES,
64     extras_require=extras,
65     python_requires=">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*",
66     license="Apache 2.0",
67     keywords="google auth oauth client",
68     classifiers=[
69         "Programming Language :: Python :: 3",
70         "Programming Language :: Python :: 3.6",
71         "Programming Language :: Python :: 3.7",
72         "Programming Language :: Python :: 3.8",
73         "Programming Language :: Python :: 3.9",
74         "Programming Language :: Python :: 3.10",
75         "Development Status :: 5 - Production/Stable",
76         "Intended Audience :: Developers",
77         "License :: OSI Approved :: Apache Software License",
78         "Operating System :: POSIX",
79         "Operating System :: Microsoft :: Windows",
80         "Operating System :: MacOS :: MacOS X",
81         "Operating System :: OS Independent",
82         "Topic :: Internet :: WWW/HTTP",
83     ],
84 )
85
```
--- 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/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
 
 
 DEPENDENCIES = (
-    "cachetools>=2.0.0,<5.0",
+    "cachetools>=2.0.0,<6.0",
     "pyasn1-modules>=0.2.1",
     # rsa==4.5 is the last version to support 2.7
     # https://github.com/sybrenstuvel/python-rsa/issues/152#issuecomment-643470233

{"golden_diff": "diff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -20,7 +20,7 @@\n \n \n DEPENDENCIES = (\n-    \"cachetools>=2.0.0,<5.0\",\n+    \"cachetools>=2.0.0,<6.0\",\n     \"pyasn1-modules>=0.2.1\",\n     # rsa==4.5 is the last version to support 2.7\n     # https://github.com/sybrenstuvel/python-rsa/issues/152#issuecomment-643470233\n", "issue": "new cachetools version (5.0.0+) can't work with google-auth\n`cachetools` has released a new version (5.0.0) which conflicts with google-auth requirements of it being <5, this prevents updates to the `cachetools` package and pose a potential security concern (as updates are no longer possible to it)\r\n\r\n```\r\nThe conflict is caused by:\r\n    The user requested cachetools==5.0.0\r\n    google-auth 2.3.3 depends on cachetools<5.0 and >=2.0.0\r\n```\r\n\r\nissue seems in https://github.com/googleapis/google-auth-library-python/blob/3c3fbf40b07e090f2be7fac5b304dbf438b5cd6c/setup.py#L23 \r\n\r\n#### Environment details\r\n\r\n  - OS: alpine3.11\r\n  - Python version: python:3.8.6\r\n  - pip version: 20.3.3\r\n  - `google-auth` version: 2.3.3 (latest at time of writing)\r\n\r\n#### Steps to reproduce\r\n\r\n  1. try pip install using latest `cachetools` with latest `google-auth`\r\n  2. pip fails\r\n\n", "before_files": [{"content": "# Copyright 2014 Google Inc.\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#      http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nimport io\nimport os\n\nfrom setuptools import find_packages\nfrom setuptools import setup\n\n\nDEPENDENCIES = (\n    \"cachetools>=2.0.0,<5.0\",\n    \"pyasn1-modules>=0.2.1\",\n    # rsa==4.5 is the last version to support 2.7\n    # https://github.com/sybrenstuvel/python-rsa/issues/152#issuecomment-643470233\n    'rsa<4.6; python_version < \"3.6\"',\n    'rsa>=3.1.4,<5; python_version >= \"3.6\"',\n    # install enum34 to support 2.7. enum34 only works up to python version 3.3.\n    'enum34>=1.1.10; python_version < \"3.4\"',\n    \"six>=1.9.0\",\n)\n\nextras = {\n    \"aiohttp\": [\n        \"aiohttp >= 3.6.2, < 4.0.0dev; python_version>='3.6'\",\n        \"requests >= 2.20.0, < 3.0.0dev\",\n    ],\n    \"pyopenssl\": \"pyopenssl>=20.0.0\",\n    \"reauth\": \"pyu2f>=0.1.5\",\n}\n\nwith io.open(\"README.rst\", \"r\") as fh:\n    long_description = fh.read()\n\npackage_root = os.path.abspath(os.path.dirname(__file__))\n\nversion = {}\nwith open(os.path.join(package_root, \"google/auth/version.py\")) as fp:\n    exec(fp.read(), version)\nversion = version[\"__version__\"]\n\nsetup(\n    name=\"google-auth\",\n    version=version,\n    author=\"Google Cloud Platform\",\n    author_email=\"googleapis-packages@google.com\",\n    description=\"Google Authentication Library\",\n    long_description=long_description,\n    url=\"https://github.com/googleapis/google-auth-library-python\",\n    packages=find_packages(exclude=(\"tests*\", \"system_tests*\")),\n    namespace_packages=(\"google\",),\n    install_requires=DEPENDENCIES,\n    extras_require=extras,\n    python_requires=\">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*\",\n    license=\"Apache 2.0\",\n    keywords=\"google auth oauth client\",\n    classifiers=[\n        \"Programming Language :: Python :: 3\",\n        \"Programming Language :: Python :: 3.6\",\n        \"Programming Language :: Python :: 3.7\",\n        \"Programming Language :: Python :: 3.8\",\n        \"Programming Language :: Python :: 3.9\",\n        \"Programming Language :: Python :: 3.10\",\n        \"Development Status :: 5 - Production/Stable\",\n        \"Intended Audience :: Developers\",\n        \"License :: OSI Approved :: Apache Software License\",\n        \"Operating System :: POSIX\",\n        \"Operating System :: Microsoft :: Windows\",\n        \"Operating System :: MacOS :: MacOS X\",\n        \"Operating System :: OS Independent\",\n        \"Topic :: Internet :: WWW/HTTP\",\n    ],\n)\n", "path": "setup.py"}], "after_files": [{"content": "# Copyright 2014 Google Inc.\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#      http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\n\nimport io\nimport os\n\nfrom setuptools import find_packages\nfrom setuptools import setup\n\n\nDEPENDENCIES = (\n    \"cachetools>=2.0.0,<6.0\",\n    \"pyasn1-modules>=0.2.1\",\n    # rsa==4.5 is the last version to support 2.7\n    # https://github.com/sybrenstuvel/python-rsa/issues/152#issuecomment-643470233\n    'rsa<4.6; python_version < \"3.6\"',\n    'rsa>=3.1.4,<5; python_version >= \"3.6\"',\n    # install enum34 to support 2.7. enum34 only works up to python version 3.3.\n    'enum34>=1.1.10; python_version < \"3.4\"',\n    \"six>=1.9.0\",\n)\n\nextras = {\n    \"aiohttp\": [\n        \"aiohttp >= 3.6.2, < 4.0.0dev; python_version>='3.6'\",\n        \"requests >= 2.20.0, < 3.0.0dev\",\n    ],\n    \"pyopenssl\": \"pyopenssl>=20.0.0\",\n    \"reauth\": \"pyu2f>=0.1.5\",\n}\n\nwith io.open(\"README.rst\", \"r\") as fh:\n    long_description = fh.read()\n\npackage_root = os.path.abspath(os.path.dirname(__file__))\n\nversion = {}\nwith open(os.path.join(package_root, \"google/auth/version.py\")) as fp:\n    exec(fp.read(), version)\nversion = version[\"__version__\"]\n\nsetup(\n    name=\"google-auth\",\n    version=version,\n    author=\"Google Cloud Platform\",\n    author_email=\"googleapis-packages@google.com\",\n    description=\"Google Authentication Library\",\n    long_description=long_description,\n    url=\"https://github.com/googleapis/google-auth-library-python\",\n    packages=find_packages(exclude=(\"tests*\", \"system_tests*\")),\n    namespace_packages=(\"google\",),\n    install_requires=DEPENDENCIES,\n    extras_require=extras,\n    python_requires=\">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*\",\n    license=\"Apache 2.0\",\n    keywords=\"google auth oauth client\",\n    classifiers=[\n        \"Programming Language :: Python :: 3\",\n        \"Programming Language :: Python :: 3.6\",\n        \"Programming Language :: Python :: 3.7\",\n        \"Programming Language :: Python :: 3.8\",\n        \"Programming Language :: Python :: 3.9\",\n        \"Programming Language :: Python :: 3.10\",\n        \"Development Status :: 5 - Production/Stable\",\n        \"Intended Audience :: Developers\",\n        \"License :: OSI Approved :: Apache Software License\",\n        \"Operating System :: POSIX\",\n        \"Operating System :: Microsoft :: Windows\",\n        \"Operating System :: MacOS :: MacOS X\",\n        \"Operating System :: OS Independent\",\n        \"Topic :: Internet :: WWW/HTTP\",\n    ],\n)\n", "path": "setup.py"}]}