MNT: Update GitHub actions, address DeprecationWarnings

[kmuehlbauer]

• Changes are documented in history.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (236bafd) 88.33% compared to head (e689189) 88.31%.

❗ Current head e689189 differs from pull request most recent head 0b19760. Consider uploading reports for the commit 0b19760 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #153      +/-   ##
==========================================
- Coverage   88.33%   88.31%   -0.03%     
==========================================
  Files          20       20              
  Lines        3439     3439              
==========================================
- Hits         3038     3037       -1     
- Misses        401      402       +1     

Flag	Coverage Δ
notebooktests	0.00% <0.00%> (?)
unittests	88.31% <100.00%> (-0.03%)	⬇️

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