Enable installation and testing with Python 3.14

[pavoljuhas]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.38%. Comparing base (82435c1) to head (033f1f2).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7761   +/-   ##
=======================================
  Coverage   99.38%   99.38%           
=======================================
  Files        1090     1090           
  Lines       98279    98279           
=======================================
  Hits        97674    97674           
  Misses        605      605           

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