bump: min Python 3.9

[Borda]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did all existing and newly added tests pass locally?

What does this PR do?

moving on from dead snake...

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

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📚 Documentation preview 📚: https://lit-utilities--331.org.readthedocs.build/en/331/

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 9 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@a6a350f). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff          @@
##             main   #331   +/-   ##
=====================================
  Coverage        ?    62%           
=====================================
  Files           ?     17           
  Lines           ?    692           
  Branches        ?      0           
=====================================
  Hits            ?    426           
  Misses          ?    266           
  Partials        ?      0           

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[Borda]

trying to fix it with google/python-fire#571