CI: Verify support on Python 3.14

[amotl]

Just maintenance.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.08%. Comparing base (dbda6c7) to head (6cf68da).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #53   +/-   ##
=======================================
  Coverage   96.08%   96.08%           
=======================================
  Files           5        5           
  Lines         179      179           
=======================================
  Hits          172      172           
  Misses          7        7           

Flag	Coverage Δ
unittests	96.08% <ø> (ø)

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