Add support for Python 3.13-3.14, drop EOL 3.8-3.9

[hugovk]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.36%. Comparing base (3204ce2) to head (40ebd4b).
⚠️ Report is 3 commits behind head on gh-pages.
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Additional details and impacted files

@@            Coverage Diff            @@
##           gh-pages     #230   +/-   ##
=========================================
  Coverage     64.36%   64.36%           
=========================================
  Files             2        2           
  Lines            87       87           
=========================================
  Hits             56       56           
  Misses           31       31           

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