chore: support Python 3.14

[gruebel]

This PR

• still a bit time till GA, but the first RC came out

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.81%. Comparing base (9d0cbe8) to head (973ecc0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #530   +/-   ##
=======================================
  Coverage   97.81%   97.81%           
=======================================
  Files          38       38           
  Lines        1786     1786           
=======================================
  Hits         1747     1747           
  Misses         39       39           

Flag	Coverage Δ
unittests	97.81% <100.00%> (ø)

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