MAINT: pre-commit fix and master->main

[mmcky]

This PR

• migrates from master to main
• fixes various maintenance items.
• updates test fixtures

[mmcky]

@DrDrij all the npm builds are failing on the testing side of things.

Would you have time to take a look. I think there are a LOT of old versions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.18%. Comparing base (e65778b) to head (631a3c8).
Report is 10 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #249   +/-   ##
=======================================
  Coverage   73.18%   73.18%           
=======================================
  Files           2        2           
  Lines         261      261           
=======================================
  Hits          191      191           
  Misses         70       70           

Flag	Coverage Δ
pytests	73.18% <100.00%> (ø)

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