initial attempt at Python 3.14 in CI

[jGaboardi]

• initial attempt at Python 3.14 in CI
• CI: Testing against Python 3.14 across federation pysal#1382

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.2%. Comparing base (015e8bb) to head (b30dcd5).
⚠️ Report is 25 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #97     +/-   ##
=======================================
+ Coverage   95.0%   96.2%   +1.2%     
=======================================
  Files          6       7      +1     
  Lines        480     473      -7     
  Branches     109       0    -109     
=======================================
- Hits         456     455      -1     
- Misses        14      18      +4     
+ Partials      10       0     -10     

see 4 files with indirect coverage changes

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