Drop support for Python 3.9, add Python 3.13 and 3.14 to supported versions

[wiegandm]

What and Why

This removes support for Python 3.9, which has reached the end-of-life status. It adds support for more recent Python versions.

[github-actions]

Conventional Commits Report

Type	Number
Changed	3

🚀 Conventional commits found.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.46%. Comparing base (b9cb74e) to head (34999cd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1192      +/-   ##
==========================================
- Coverage   90.33%   89.46%   -0.87%     
==========================================
  Files         111      111              
  Lines        7327     6733     -594     
  Branches      842      842              
==========================================
- Hits         6619     6024     -595     
  Misses        500      500              
- Partials      208      209       +1     

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