fix: Python 3.8 support

[daniel-sanche]

There were recently some type annotation changes that weren't compatible with python 3.8. This PR fixes those, and adds back 3.8 tests using github actions

[gemini-code-assist]

Summary of Changes

Hello @daniel-sanche, 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 addresses a regression in Python 3.8 support by restoring the necessary test configurations and making a minor type import adjustment. The primary goal is to ensure that the project is fully tested and functional on Python 3.8, aligning with its intended compatibility.

Highlights

• Python 3.8 Support: Re-enabled testing for Python 3.7 and 3.8 by adding them back to the UNIT_TEST_PYTHON_VERSIONS list in noxfile.py.
• Type Hinting Compatibility: Updated the import of Sequence from collections.abc to typing in google/auth/_default.py for broader compatibility across Python versions.

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[gemini-code-assist]

Code Review

This pull request aims to restore Python 3.8 support. The change in google/auth/_default.py to use typing.Sequence is correct for ensuring compatibility. In noxfile.py, Python 3.7 and 3.8 are correctly added to the list of unit test versions. However, a necessary change to the nox.options.sessions list seems to have been missed, which would prevent the newly added tests for Python 3.7 and 3.8 from running by default. I've added a comment with details.

[cashpilotthrive-hue]

Confirming all

[parthea]

LGTM assuming that 3.7 will be removed prior to releasing