ci: update actions and their config

[Comandeer]

Closes #28.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 19.04%. Comparing base (9569710) to head (7f73561).
Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #33       +/-   ##
===========================================
- Coverage   68.91%   19.04%   -49.87%     
===========================================
  Files           9        9               
  Lines         312       42      -270     
  Branches       19        0       -19     
===========================================
- Hits          215        8      -207     
+ Misses         97       34       -63     

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