build: drop python 3.8, support python 3.13

[tlambert03]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 86.85%. Comparing base (83c0308) to head (c6e0fb5). Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #260   +/-   ##
=======================================
  Coverage   86.85%   86.85%           
=======================================
  Files          25       25           
  Lines        1263     1263           
=======================================
  Hits         1097     1097           
  Misses        166      166           

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #260 will not alter performance

_{Comparing py313 (c6e0fb5) with main (83c0308)}

Summary

✅ 9 untouched benchmarks

[tlambert03]

this should work with python 3.13 after the xsdata typing deprecation is fixed: https://github.com/tefra/xsdata/pull/1077

(for some reason, even if I ignore that deprecation error in pytest config here, it still raises the xsdata exception

[tlambert03]

needed to add some special consideration to the tests to deal with a deprecation warning that gets triggered in xsdata by https://github.com/tefra/xsdata/issues/1111