[Build] Test on Python 3.14

[riedgar-ms]

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Now that Python 3.14 is out, add it to the test matrix.

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Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 59.28%. Comparing base (58ed18f) to head (032590a). :exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

:exclamation: There is a different number of reports uploaded between BASE (58ed18f) and HEAD (032590a). Click for more details.

HEAD has 521 uploads less than BASE

Flag	BASE (58ed18f)	HEAD (032590a)
	524	3

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1385       +/-   ##
===========================================
- Coverage   77.31%   59.28%   -18.04%     
===========================================
  Files          62       62               
  Lines        5118     5118               
===========================================
- Hits         3957     3034      -923     
- Misses       1161     2084      +923     

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