build: drop python 3.8, support python 3.13

[tlambert03]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.83%. Comparing base (578fb86) to head (db4fa3e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
+ Coverage   86.67%   86.83%   +0.16%     
==========================================
  Files          25       25              
  Lines        1253     1261       +8     
==========================================
+ Hits         1086     1095       +9     
+ Misses        167      166       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[codspeed-hq]

CodSpeed Performance Report

Merging #260 will improve performances by 15.28%

_{Comparing py313 (db4fa3e) with main (578fb86)}

Summary

⚡ 2 improvements
✅ 7 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	py313	Change
⚡	test_time_from_dict_to_ome[med]	28.7 ms	24.9 ms	+14.99%
⚡	test_time_from_dict_to_ome[small]	2.5 ms	2.1 ms	+15.28%

[tlambert03]

this should work with python 3.13 after the xsdata typing deprecation is fixed: tefra/xsdata#1077

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