build: drop python <3.10

[tlambert03]

won't release for a little bit

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.76%. Comparing base (1685e98) to head (12b5592).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
- Coverage   95.89%   95.76%   -0.14%     
==========================================
  Files          13       13              
  Lines         414      401      -13     
==========================================
- Hits          397      384      -13     
  Misses         17       17              

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