feat: support python 3.14

[Linchin]

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @Linchin, 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 compatibility and official support for Python 3.14. It updates the project's metadata to reflect this new support and ensures that the correct grpcio dependency version is used when running on Python 3.14.

Highlights

• Python 3.14 Support: The project now officially declares support for Python 3.14 by adding it to the classifiers in setup.py.
• Dependency Update: A specific version of grpcio (>= 1.75.1, < 2.0.0) has been added as a dependency requirement for Python 3.14 environments.

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[gemini-code-assist]

Code Review

This pull request adds support for Python 3.14 by updating setup.py. It adds a new grpcio dependency constraint for Python 3.14 and includes the Programming Language :: Python :: 3.14 classifier.

While the changes are functionally correct, I've suggested a small improvement to the dependency specifiers for grpcio to make them more explicit and maintainable by avoiding overlapping version conditions.

Additionally, to fully complete Python 3.14 support, you might need to:

• Add Python 3.14 to your CI test matrix to ensure everything works as expected.
• Add a testing/constraints-3.14.txt file, similar to the ones for other Python versions.

Overall, this is a good step towards supporting the next version of Python.

[Linchin]

samples-3.14 will not pass until GoogleCloudPlatform/python-docs-samples#13596 is merged. So for now we will mark this test as not required.

[Linchin]

/gemini review

[gemini-code-assist]

Code Review

This pull request adds support for Python 3.14 by updating the necessary configuration files, test definitions, and package metadata. The changes in .kokoro configs, setup.py, and the test matrices in noxfile.py are appropriate for supporting the new Python version. I have one suggestion in noxfile.py to reduce code duplication and improve maintainability. Additionally, a critical update seems to be missing in noxfile.py which I cannot comment on directly. The prerelease_deps session needs to be updated to run on Python 3.14. This involves updating the @nox.session decorator (line 426) and the conditional check for the cpp protobuf implementation (line 434) to include Python 3.14. Without these changes, the prerelease-deps-3.14 CI job will likely fail.