Add testing against the Python 3.13 release

[miketheman]

Add testing against the Python 3.13 beta release.

• .github/workflows/python.yml

  • Add 3.13 to the python-version matrix.

• pyproject.toml

  • Add 3.13 to the classifiers section under Programming Language :: Python.

[miketheman]

Waiting on a release from greenlet to support 3.13: python-greenlet/greenlet#396 Released in greenlet 3.1.0

[codeclimate]

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[Copilot]

PR Overview

This PR adds testing for the Python 3.13 beta release by updating configuration files and adjusting type annotations in testing utilities. The key changes include:

• Adding Python 3.13 support in the GitHub Actions workflow.
• Updating the Python classifiers and minimum version in pyproject.toml.
• Adjusting type annotations in pytest_socket.py to use built-in generic types.

Reviewed Changes

File	Description
pyproject.toml	Added Python 3.13 classifier and bumped the minimum Python version to 3.9.
.pre-commit-config.yaml	Updated pyupgrade arguments to require Python 3.9+.
.github/workflows/python.yml	Removed Python 3.8 and added Python 3.13 to the CI testing matrix.
pytest_socket.py	Converted type annotations from typing generics to built-in generics for consistency with Python 3.9+.

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (3)

pyproject.toml:33

• Ensure that upgrading the minimum Python version from 3.8 to 3.9 is intentional and aligns with your support strategy for older versions of Python.

python = "^3.9"

.github/workflows/python.yml:22

• Verify that removing Python 3.8 from the CI matrix is consistent with the intended project compatibility requirements.

python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]

pytest_socket.py:77

• Confirm that transitioning to built-in generic types (list[str], dict[str, set[str]]) is compatible with your development and documentation tools, given the minimum version bump.

allow_hosts: typing.Union[str, list[str], None]