Declare support for Python 3.14 in pyproject.toml

[justinchuby]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.42%. Comparing base (647754f) to head (2d9103d).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2663      +/-   ##
==========================================
- Coverage   70.42%   70.42%   -0.01%     
==========================================
  Files         224      224              
  Lines       26729    26729              
  Branches     2673     2673              
==========================================
- Hits        18825    18823       -2     
- Misses       6973     6974       +1     
- Partials      931      932       +1     

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