Add Python 3.14 to CI and pyproject

[BenediktBurger]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.27%. Comparing base (b1780e6) to head (f543ead).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #144   +/-   ##
=======================================
  Coverage   91.27%   91.27%           
=======================================
  Files          39       39           
  Lines        3130     3130           
  Branches      323      323           
=======================================
  Hits         2857     2857           
  Misses        231      231           
  Partials       42       42           

Flag	Coverage Δ
unittests	91.27% <ø> (ø)

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