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 83.31%. Comparing base (131887b) to head (d67feba).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #941   +/-   ##
=======================================
  Coverage   83.31%   83.31%           
=======================================
  Files          22       22           
  Lines        4952     4952           
  Branches     1185     1185           
=======================================
  Hits         4126     4126           
  Misses        548      548           
  Partials      278      278           

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