Add Python 3.14 to the test and release matrix

[pelson]

Relates:

• Pre-built Python 3.14 wheels? #1335
• [CI] add Python 3.13 #1267

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.57%. Comparing base (029cfe8) to head (c5d7f29).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1338      +/-   ##
==========================================
+ Coverage   86.53%   86.57%   +0.03%     
==========================================
  Files         113      113              
  Lines       10496    10496              
  Branches     4029     4029              
==========================================
+ Hits         9083     9087       +4     
+ Misses        814      808       -6     
- Partials      599      601       +2     

see 3 files with indirect coverage changes

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