Add Python 3.14 to CI workflow matrix

[jmbhughes]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.92%. Comparing base (f09fa91) to head (6f2037a).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #250   +/-   ##
=======================================
  Coverage   81.92%   81.92%           
=======================================
  Files           8        8           
  Lines         664      664           
=======================================
  Hits          544      544           
  Misses        120      120           

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