Update tox.ini and setup.cfg

[jalving]

This PR contains minor changes to configuration files to fix linting and notebook test failures that appeared due to dependency updates.

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[codecov[bot]]

Codecov Report

Merging #93 (87df7d0) into main (6b1168e) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #93   +/-   ##
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  Coverage   94.19%   94.19%           
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  Files          25       25           
  Lines        1240     1240           
  Branches      192      192           
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  Hits         1168     1168           
  Misses         42       42           
  Partials       30       30           

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[rmisener]

Thanks a lot for these changes. It looks like it was minor in the end, but probably a big headache. Looks good!