chore: Bump version matrix

[antonagestam]

• Drop support for Python 3.8, which has imminent EOL.
• Add support for Python 3.13.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.91%. Comparing base (ebd5f66) to head (9ca45e3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #298      +/-   ##
==========================================
- Coverage   98.91%   98.91%   -0.01%     
==========================================
  Files          27       27              
  Lines        1018     1016       -2     
  Branches      160      160              
==========================================
- Hits         1007     1005       -2     
  Misses         11       11              

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