Drop Python 3.9 support in typespec-python

[Copilot]

Python 3.9 reached end-of-life, so bump the minimum supported Python version to 3.10 in @azure-tools/typespec-python.

• Runtime version guards: bumped the sys.version_info check (and error message) from (3, 9, 0) to (3, 10, 0) in eng/scripts/setup/install.py and prepare.py, and updated the patchPythonPath requirement in eng/scripts/setup/run-python3.ts from >=3.9 to >=3.10.
• Static analysis configs: updated target Python version to 3.10 in pylintrc, pyrightconfig.json, mypy.ini, and the --py-version flag passed in run_pylint.py.
• Changelog: added a breaking chronus entry under .chronus/changes/.

# eng/scripts/setup/install.py / prepare.py
if not sys.version_info >= (3, 10, 0):
    raise Exception("Autorest for Python extension requires Python 3.10 at least")

[azure-sdk]

All changed packages have been documented.

• ✅ @azure-tools/typespec-python

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@azure-tools/typespec-python - deprecation ✏️

Drop support for Python 3.9. The minimum supported Python version is now 3.10.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@azure-tools/typespec-python@4329

commit: c077117

[azure-sdk]

You can try these changes here

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