build(python): bump minimum Python version to 3.9

[d33bs]

Description

This PR bumps the minimum Python version required by Pycytominer to 3.9 (3.8 will no longer be compatible). Python 3.8 is end-of-life as of this month and there are related dependency issues which could possibly be resolved by removing Python 3.8 as a minimum version.

Thanks for any feedback!

Closes #433

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• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.73%. Comparing base (e8880bc) to head (09b9cef).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #464      +/-   ##
==========================================
- Coverage   94.74%   94.73%   -0.01%     
==========================================
  Files          57       57              
  Lines        3156     3155       -1     
==========================================
- Hits         2990     2989       -1     
  Misses        166      166              

Flag	Coverage Δ
unittests	94.73% <100.00%> (-0.01%)	⬇️

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[kenibrewer]

@d33bs Can you update this line
to py39 and rerun ruff for the new changes?

[gwaybio]

great to see! Let's also see if @kenibrewer has any comments.

@d33bs - is it worth also addressing #435 here (or soon)?

[d33bs]

Can you update this line
to py39 and rerun ruff for the new changes?

Thanks @kenibrewer ! I've just added changes which bump the ruff target version and make related typing changes.

@d33bs - is it worth also addressing #435 here (or soon)?

Thanks @gwaybio ! My feeling is that Python 3.12 could possibly have surprises for us that lead to more complex changes or decision-making (I don't know of anything off-hand, but I expect something could pop up). This might be over-doing it, but as a result, I think it might be good to keep those changes in an adjacent PR.