Drop Python 3.9, minor cleanups

[wRAR]

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 99.16%. Comparing base (28b9c2d) to head (492cbe3). :warning: Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #42   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files           4        4           
  Lines         239      239           
  Branches       43       43           
=======================================
  Hits          237      237           
  Misses          1        1           
  Partials        1        1           

Files with missing lines	Coverage Δ
andi/andi.py	100.00% <100.00%> (ø)
andi/typeutils.py	96.61% <100.00%> (ø)

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