CI: Add 3.14 in GH actions

[bashtage]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.57%. Comparing base (1627d75) to head (c706879).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #665   +/-   ##
=======================================
  Coverage   99.57%   99.57%           
=======================================
  Files          99       99           
  Lines       17278    17278           
  Branches     1419     1419           
=======================================
  Hits        17205    17205           
  Misses         27       27           
  Partials       46       46           

Flag	Coverage Δ
adder	99.56% <ø> (ø)
subtractor	99.56% <ø> (ø)

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