CI: adding Python 3.14 for testing

[bsipocz]

The sphinxdev jobs will fail, but we need to double check if there is anything new mixed in there due to python 3.14

[bsipocz]

@pllim - I don't spot any additional failures, it's the same 50 as before, so I think this is a go ahead as is.

[pllim]

Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.83%. Comparing base (e538cf8) to head (f50a016).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #217   +/-   ##
=======================================
  Coverage   89.83%   89.83%           
=======================================
  Files          31       31           
  Lines        1249     1249           
=======================================
  Hits         1122     1122           
  Misses        127      127           

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[bsipocz]

codecov bot is a bit late to this party 😂