MNT: fix path for notebook coverage

[kmuehlbauer]

• Changes are documented in history.md

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.79%. Comparing base (045b510) to head (fea3311).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
+ Coverage   89.91%   90.79%   +0.87%     
==========================================
  Files          20       20              
  Lines        3421     3421              
==========================================
+ Hits         3076     3106      +30     
+ Misses        345      315      -30     

Flag	Coverage Δ
notebooktests	79.59% <ø> (+79.59%)	⬆️
unittests	89.91% <ø> (ø)

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