deps: Drop python 3.8

[codecov[bot]]

Codecov Report

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

Project coverage is 86.99%. Comparing base (d848426) to head (9ca3bac).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2423 +/- ## ========================================== + Coverage 86.69% 86.99% +0.29% ========================================== Files 235 236 +1 Lines 44764 44789 +25 Branches 8298 8351 +53 ========================================== + Hits 38810 38962 +152 + Misses 5226 5099 -127 Partials 728 728 ```

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