Drop support for Python 3.9

[hugovk]

It's almost end-of-life:

• https://devguide.python.org/versions/
• https://peps.python.org/pep-0596/

Also bump GitHub Actions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.14%. Comparing base (e2a0555) to head (5517680).
⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #629      +/-   ##
==========================================
+ Coverage   92.23%   93.14%   +0.91%     
==========================================
  Files          28       29       +1     
  Lines        3105     3226     +121     
==========================================
+ Hits         2864     3005     +141     
+ Misses        241      221      -20     

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[claudep]

Thanks, but what about releasing 3.9.0 before removing Python 3.9 support?

[hugovk]

Good idea, I'll move this to draft for now and can release 3.9.0 in the next week or two.

[claudep]

Awesome, thanks!

[hugovk]

https://pypi.org/project/tablib/3.9.0/ is released, this is now ready for review.

[claudep]

Thanks, looks good!