build: drop python 3.9, add 3.14

[tlambert03]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 98.36066% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.97%. Comparing base (40a6ad8) to head (4bc5e15).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/useq/_plot.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #249      +/-   ##
==========================================
- Coverage   94.98%   94.97%   -0.01%     
==========================================
  Files          19       19              
  Lines        1496     1494       -2     
==========================================
- Hits         1421     1419       -2     
  Misses         75       75              

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