chore: remove python 3.9 support.

[chandra-siri]

chore: remove python 3.9 support.

Details in b/483015736

[gemini-code-assist]

Summary of Changes

Hello @chandra-siri, 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 focuses on removing Python 3.9 support from the project. This involves changes to the noxfile.py to exclude Python 3.9 from the test matrix and updating setup.py to reflect the minimum supported Python version.

Highlights

• Python 3.9 Support Removal: This PR removes support for Python 3.9 from the project.
• noxfile.py Updates: The noxfile.py file has been modified to remove Python 3.9 from the list of tested versions.
• setup.py Updates: The setup.py file has been updated to reflect the removal of Python 3.9 support, updating the python_requires and removing 3.9 from the classifiers.

Changelog

• .librarian/generator-input/noxfile.py
  • Removed Python 3.9 from SYSTEM_TEST_PYTHON_VERSIONS and UNIT_TEST_PYTHON_VERSIONS.
  • Removed session for unit-3.9
• .librarian/generator-input/setup.py
  • Removed Python 3.9 from classifiers.
• noxfile.py
  • Removed re import.
  • Removed Python 3.9 from SYSTEM_TEST_PYTHON_VERSIONS and UNIT_TEST_PYTHON_VERSIONS.
  • Removed session for unit-3.9
• setup.py
  • Removed Python 3.9 from classifiers.
  • Updated python_requires to '>=3.10'.

Activity

• The PR author, chandra-siri, has made changes to remove Python 3.9 support.
• The changes include modifications to noxfile.py and setup.py.

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Code Review

The code changes remove support for Python 3.7, 3.8, and 3.9. Specifically, the changes modify .librarian/generator-input/noxfile.py, noxfile.py, and setup.py to remove Python 3.7, 3.8, and 3.9 from the test matrix and supported versions. Additionally, the python_requires in setup.py is updated to require Python 3.10 or higher. The import of the re module was also removed from noxfile.py.