[MNT] Support python 3.13

[Tveten]

• Support python 3.13
• Delete optuna and plotly from soft dependencies. Unused so far.
• Improve CI coverage for different python versions. Consider running for all supported python versions and OS's in the future.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.50%. Comparing base (b1d0826) to head (54ebd2e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #52   +/-   ##
=======================================
  Coverage   97.50%   97.50%           
=======================================
  Files          40       40           
  Lines        1680     1680           
=======================================
  Hits         1638     1638           
  Misses         42       42           

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