Drop Python 3.9

[Dreamsorcerer]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.52%. Comparing base (619bc22) to head (9d268f0).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #739   +/-   ##
=======================================
  Coverage   96.52%   96.52%           
=======================================
  Files          23       23           
  Lines        1871     1871           
  Branches      111      111           
=======================================
  Hits         1806     1806           
  Misses         43       43           
  Partials       22       22           

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