[SCSB-145] require Python 3.10

[zacharyburnett]

resolves SCSB-145

propagate Astropy's deprecation of Python 3.9 to downstream packages

[!NOTE] this PR was generated automatically by batchpr :robot:

[codecov[bot]]

Codecov Report

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

Project coverage is 74.44%. Comparing base (c9b5119) to head (ca4d673).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #612 +/- ## ======================================== Coverage 74.44% 74.44% ======================================== Files 18 18 Lines 6645 6645 ======================================== Hits 4947 4947 Misses 1698 1698 ```

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