fix: properly update to scikit-package 0.3

[john-halloran]

There were some relics of older scikit-package versions hanging around. Should be all fixed now.

[john-halloran]

Fixes #161.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.50%. Comparing base (d7586bc) to head (8d4b8e4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #188   +/-   ##
=======================================
  Coverage   77.50%   77.50%           
=======================================
  Files           3        3           
  Lines          40       40           
=======================================
  Hits           31       31           
  Misses          9        9           

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