CI: Add Python 3.14 support

[offa]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.23%. Comparing base (682d830) to head (0124cae).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1606   +/-   ##
=======================================
  Coverage   42.23%   42.23%           
=======================================
  Files          66       66           
  Lines        8595     8595           
  Branches     1038     1038           
=======================================
  Hits         3630     3630           
  Misses       4825     4825           
  Partials      140      140           

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