👷 Update coverage CI setup

[falexwolf]

See title.

[codecov]

Codecov Report

Merging #101 (9232374) into main (f02a701) will increase coverage by 26.74%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main     #101       +/-   ##
===========================================
+ Coverage   43.52%   70.27%   +26.74%     
===========================================
  Files          16       16               
  Lines         556      619       +63     
===========================================
+ Hits          242      435      +193     
+ Misses        314      184      -130     

Impacted Files	Coverage Δ
nbproject/dev/_test.py	20.00% <0.00%> (-80.00%)	⬇️
tests/test_notebooks.py
tests/conftest.py
tests/test_cli.py
nbproject/header.py	100.00% <0.00%> (ø)
nbproject/_nbproject_cli.py	67.03% <0.00%> (ø)
nbproject/__main__.py	90.47% <0.00%> (ø)
nbproject/dev/_jupyter_communicate.py	22.22% <0.00%> (+6.34%)	⬆️
nbproject/_meta.py	72.97% <0.00%> (+31.08%)	⬆️
nbproject/dev/_initialize.py	100.00% <0.00%> (+36.36%)	⬆️
... and 4 more

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[github-actions]

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