add Python 3.14 and drop Python 3.9

[methane]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.84%. Comparing base (e2a908b) to head (1357846).
⚠️ Report is 31 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #774      +/-   ##
==========================================
- Coverage   88.86%   88.84%   -0.02%     
==========================================
  Files           7        7              
  Lines         548      556       +8     
==========================================
+ Hits          487      494       +7     
- Misses         61       62       +1     

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