Added support for python 3.14 and done some pending 3.9 removals

[acroca]

• Added support for 3.14
• Some chores removing 3.9 from missing places.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.73%. Comparing base (bffb749) to head (5b59182).
⚠️ Report is 74 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #916      +/-   ##
==========================================
+ Coverage   86.63%   86.73%   +0.10%     
==========================================
  Files          84      103      +19     
  Lines        4473     7130    +2657     
==========================================
+ Hits         3875     6184    +2309     
- Misses        598      946     +348     

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