Starlette 0.52.0 ModuleNotFoundError on Python >= 3.13

[oefe]

Starlette 0.52.0 adds an import typing_extensions in requests.py. This fails on Python >=3.13, since typing_extensions is only a dependency for Python < 3.13:

dependencies = [
    "anyio>=3.6.2,<5",
    "typing_extensions>=4.10.0; python_version < '3.13'",
]

I found this while trying to run marimo:

❯ uvx --python 3.12 marimo --version
Installed 23 packages in 100ms
0.19.4
❯ uvx --python 3.13 marimo --version
Traceback (most recent call last):
  File "/Users/martinaoefelein/.cache/uv/archive-v0/Z3z-bKX5iWmPL2nX4PJZt/bin/marimo", line 6, in <module>
    from marimo._cli.cli import main
  File "/Users/martinaoefelein/.cache/uv/archive-v0/Z3z-bKX5iWmPL2nX4PJZt/lib/python3.13/site-packages/marimo/_cli/cli.py", line 37, in <module>
    from marimo._server.start import start
  File "/Users/martinaoefelein/.cache/uv/archive-v0/Z3z-bKX5iWmPL2nX4PJZt/lib/python3.13/site-packages/marimo/_server/start.py", line 12, in <module>
    import marimo._server.api.lifespans as lifespans
  File "/Users/martinaoefelein/.cache/uv/archive-v0/Z3z-bKX5iWmPL2nX4PJZt/lib/python3.13/site-packages/marimo/_server/api/lifespans.py", line 11, in <module>
    from marimo._server.ai.tools.tool_manager import setup_tool_manager
  File "/Users/martinaoefelein/.cache/uv/archive-v0/Z3z-bKX5iWmPL2nX4PJZt/lib/python3.13/site-packages/marimo/_server/ai/tools/tool_manager.py", line 6, in <module>
    from starlette.applications import (
        Starlette,  # noqa: TCH002 - required at runtime
    )
  File "/Users/martinaoefelein/.cache/uv/archive-v0/Z3z-bKX5iWmPL2nX4PJZt/lib/python3.13/site-packages/starlette/applications.py", line 9, in <module>
    from starlette.middleware.base import BaseHTTPMiddleware
  File "/Users/martinaoefelein/.cache/uv/archive-v0/Z3z-bKX5iWmPL2nX4PJZt/lib/python3.13/site-packages/starlette/middleware/base.py", line 9, in <module>
    from starlette.requests import ClientDisconnect, Request
  File "/Users/martinaoefelein/.cache/uv/archive-v0/Z3z-bKX5iWmPL2nX4PJZt/lib/python3.13/site-packages/starlette/requests.py", line 9, in <module>
    from typing_extensions import TypeVar
ModuleNotFoundError: No module named 'typing_extensions'

[Kludex]

I'll fix in half an hour. Sorry.

[Kludex]

#3109 👍

[Kludex]

Done. 👍