build: drop python 3.8

[tlambert03]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.18%. Comparing base (178e8ba) to head (dad1eee).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
- Coverage   94.51%   94.18%   -0.33%     
==========================================
  Files          20       20              
  Lines        2441     2443       +2     
==========================================
- Hits         2307     2301       -6     
- Misses        134      142       +8     

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[codspeed-hq]

CodSpeed Performance Report

Merging #253 will not alter performance

_{Comparing drop-38 (dad1eee) with main (178e8ba)}

Summary

✅ 13 untouched benchmarks