build: drop python 3.8

[tlambert03]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #341 will not alter performance

_{Comparing tlambert03:drop38 (543b559) with main (7be0254)}

Summary

✅ 67 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7be0254) to head (543b559).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #341   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines         2088      2095    +7     
=========================================
+ Hits          2088      2095    +7     

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