tests: update default python runtime for tests to 3.14

[parthea]

Similar to googleapis/python-api-core#870

[gemini-code-assist]

Summary of Changes

Hello @parthea, 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 updates the default Python version used for testing and linting within the Nox configuration. The change ensures that these automated processes leverage a more recent Python runtime, specifically targeting version 3.14, and standardizes the Python version used across relevant Nox sessions.

Highlights

• Default Python Version Update: The DEFAULT_PYTHON_VERSION in noxfile.py has been updated from 3.8 to 3.14.
• Nox Session Python Version Alignment: The lint and lint_setup_py Nox sessions now dynamically use the DEFAULT_PYTHON_VERSION variable instead of being hardcoded to 3.10.

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Ignored Files

• Ignored by pattern: .github/workflows/** (3)
  • .github/workflows/lint.yml
  • .github/workflows/mypy.yml
  • .github/workflows/unittest.yml

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[gemini-code-assist]

Code Review

This pull request updates the default Python version to 3.14 for various nox sessions. The changes correctly update the DEFAULT_PYTHON_VERSION constant and refactor the lint and lint_setup_py sessions to use this constant, which is a good improvement for maintainability. The changes look good, and I have one suggestion to improve consistency even further.

[gemini-code-assist]

While this DEFAULT_PYTHON_VERSION is now used by most nox sessions, the docs and docfx sessions are still hardcoded to use Python 3.10. For better maintainability and consistency, consider updating them to use this DEFAULT_PYTHON_VERSION constant as well, if their dependencies are compatible.

[parthea]

This is blocked on googleapis/sphinx-docfx-yaml#345.
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