bump python 3.13 drop python 3.9

[waltsims]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.75%. Comparing base (e35b406) to head (7452880).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #505      +/-   ##
==========================================
+ Coverage   72.53%   72.75%   +0.22%     
==========================================
  Files          46       46              
  Lines        6805     6783      -22     
  Branches     1313     1304       -9     
==========================================
- Hits         4936     4935       -1     
+ Misses       1311     1290      -21     
  Partials      558      558              

Flag	Coverage Δ
3.10	72.75% <ø> (ø)
3.11	72.75% <ø> (ø)
3.12	72.75% <ø> (ø)
3.13	72.72% <ø> (?)
3.9	?
macos-latest	72.72% <ø> (+0.22%)	⬆️
ubuntu-latest	72.72% <ø> (+0.22%)	⬆️
windows-latest	72.72% <ø> (+0.22%)	⬆️

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