chore(python): Add support for Python 3.14

[chalmerlowe]

This PR adds support for Python 3.14 to the library.

Key changes include:

• Updating noxfile.py to include 3.14 sessions.
• Updating CONTRIBUTING.rst to list Python 3.14 as a supported version and refreshing other
  version-related information.
• Correcting outdated file paths in owlbot.py excludes.

[gemini-code-assist]

Summary of Changes

Hello @chalmerlowe, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces support for Python 3.14 across the project's development environment. The change primarily involves updating the automated configuration generation process to recognize and include Python 3.14 in the list of compatible Python versions, ensuring that testing and build processes can leverage the new interpreter version.

Highlights

• Python 3.14 Support: Added support for Python 3.14 by updating the owlbot.py configuration to include it in the list of supported Python versions for noxfile.py.
• Configuration Update: Modified the owlbot.py script to automatically inject Python 3.14 into the noxfile.py's session Python version checks.

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[gemini-code-assist]

Code Review

This pull request aims to add support for Python 3.14. The current change in owlbot.py is incorrect because it attempts to replace a string that doesn't exist in noxfile.py. I've provided a suggestion to correctly update the UNIT_TEST_PYTHON_VERSIONS list. To complete the support for Python 3.14, you will also need to update nox.options.sessions and potentially other Python version lists in noxfile.py.

[parthea]

This is blocked on Python 3.14 support in google-crc32c similar to #1445 (comment)