CI: Add Python 3.14 build

[dbaston]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.79%. Comparing base (3e3a5b6) to head (63a2e7b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #181      +/-   ##
==========================================
+ Coverage   90.63%   90.79%   +0.16%     
==========================================
  Files          85       85              
  Lines        6844     6597     -247     
  Branches      645      646       +1     
==========================================
- Hits         6203     5990     -213     
+ Misses        607      573      -34     
  Partials       34       34              

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