build: drop python 3.8

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #341 will not alter performance

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

Summary

✅ 67 untouched benchmarks

[codecov[bot]]

Codecov Report

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

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

Additional details and impacted files

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

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