We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
v0.43.0 requires pydantic, but is marked optional
Attempting to start a very simple server results in:

```
$ strawberry server app
Traceback (most recent call last):
  File "/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/bin/strawberry", line 5, in <module>
    from strawberry.cli import run
  File "/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/__init__.py", line 1, in <module>
    from . import experimental, federation
  File "/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/__init__.py", line 1, in <module>
    from . import pydantic
  File "/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/pydantic/__init__.py", line 1, in <module>
    from .error_type import error_type
  File "/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/pydantic/error_type.py", line 4, in <module>
    from pydantic import BaseModel
ModuleNotFoundError: No module named 'pydantic'
```

Even though pyproject.toml has pydantic marked as optional: https://github.com/strawberry-graphql/strawberry/blob/master/pyproject.toml#L37

app.py is:

```
import asyncio

import strawberry


async def resolve_hello(root, info, name: str) -> str:
    await asyncio.sleep(1)
    return f"Hello {name}"


@strawberry.type
class Query:
    hello: str = strawberry.field(resolver=resolve_hello)


schema = strawberry.Schema(query=Query)
```

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `strawberry/experimental/__init__.py`
Content:
```
1 from . import pydantic
2 
3 
4 __all__ = ["pydantic"]
5
```
--- 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/strawberry/experimental/__init__.py b/strawberry/experimental/__init__.py
--- a/strawberry/experimental/__init__.py
+++ b/strawberry/experimental/__init__.py
@@ -1,4 +1,6 @@
-from . import pydantic
-
-
-__all__ = ["pydantic"]
+try:
+    from . import pydantic
+except ImportError:
+    pass
+else:
+    __all__ = ["pydantic"]

{"golden_diff": "diff --git a/strawberry/experimental/__init__.py b/strawberry/experimental/__init__.py\n--- a/strawberry/experimental/__init__.py\n+++ b/strawberry/experimental/__init__.py\n@@ -1,4 +1,6 @@\n-from . import pydantic\n-\n-\n-__all__ = [\"pydantic\"]\n+try:\n+    from . import pydantic\n+except ImportError:\n+    pass\n+else:\n+    __all__ = [\"pydantic\"]\n", "issue": "v0.43.0 requires pydantic, but is marked optional\nAttempting to start a very simple server results in:\r\n\r\n```\r\n$ strawberry server app\r\nTraceback (most recent call last):\r\n  File \"/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/bin/strawberry\", line 5, in <module>\r\n    from strawberry.cli import run\r\n  File \"/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/__init__.py\", line 1, in <module>\r\n    from . import experimental, federation\r\n  File \"/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/__init__.py\", line 1, in <module>\r\n    from . import pydantic\r\n  File \"/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/pydantic/__init__.py\", line 1, in <module>\r\n    from .error_type import error_type\r\n  File \"/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/pydantic/error_type.py\", line 4, in <module>\r\n    from pydantic import BaseModel\r\nModuleNotFoundError: No module named 'pydantic'\r\n```\r\n\r\nEven though pyproject.toml has pydantic marked as optional: https://github.com/strawberry-graphql/strawberry/blob/master/pyproject.toml#L37\r\n\r\napp.py is:\r\n\r\n```\r\nimport asyncio\r\n\r\nimport strawberry\r\n\r\n\r\nasync def resolve_hello(root, info, name: str) -> str:\r\n    await asyncio.sleep(1)\r\n    return f\"Hello {name}\"\r\n\r\n\r\n@strawberry.type\r\nclass Query:\r\n    hello: str = strawberry.field(resolver=resolve_hello)\r\n\r\n\r\nschema = strawberry.Schema(query=Query)\r\n```\n", "before_files": [{"content": "from . import pydantic\n\n\n__all__ = [\"pydantic\"]\n", "path": "strawberry/experimental/__init__.py"}], "after_files": [{"content": "try:\n    from . import pydantic\nexcept ImportError:\n    pass\nelse:\n    __all__ = [\"pydantic\"]\n", "path": "strawberry/experimental/__init__.py"}]}