Trigger Python workflow in PRs which modify it

[cottsay]

It can be dispatched manually, but it makes sense to just run it automatically if we're trying to modify it (i.e. #22)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 42.67%. Comparing base (ed84f60) to head (0a46694).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   42.67%   42.67%           
=======================================
  Files          20       20           
  Lines        2615     2615           
  Branches      532      532           
=======================================
  Hits         1116     1116           
  Misses       1244     1244           
  Partials      255      255           

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