gh-actions: test Python 3.14.0rc1

[mr-c]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.55%. Comparing base (cd695e9) to head (a0305a4).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #366      +/-   ##
==========================================
+ Coverage   34.53%   34.55%   +0.01%     
==========================================
  Files          30       30              
  Lines       35375    35375              
  Branches     9555     9555              
==========================================
+ Hits        12218    12224       +6     
+ Misses      20269    20266       -3     
+ Partials     2888     2885       -3     

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