chore: remove 3.9 from kokoro tests

[parthea]

Similar to googleapis/python-firestore#1163 . Python 3.9 tests will run in Github actions after the migration to google-cloud-python.

[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 project's testing configuration by discontinuing Python 3.9 unit tests within the Kokoro environment. This adjustment is a preparatory step for a planned migration, after which Python 3.9 tests will be executed through GitHub Actions, optimizing the overall testing workflow.

Highlights

• Test Configuration Update: Python 3.9 unit tests have been removed from the Kokoro test configuration in noxfile.py files.
• Testing Infrastructure Shift: This change prepares for Python 3.9 tests to be run via GitHub Actions after an upcoming migration.

Changelog

• .librarian/generator-input/noxfile.py
  • Removed the 'unit-3.9' session from the nox.options.sessions list.
• noxfile.py
  • Removed the 'unit-3.9' session from the nox.options.sessions list.

Activity

• No human activity has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request removes the unit-3.9 test session from the default nox sessions in both the source and generated noxfile.py files. This change correctly implements the goal of disabling Python 3.9 tests in the default Kokoro runs, while keeping the session available for other CI environments like GitHub Actions. The changes look good.