[SCSB-170] pin Python<3.13

[zacharyburnett]

Resolves SCSB-170

Checklist

• [x] ~added entry in CHANGES.rst (either in Bug Fixes or Changes to API)~
• [ ] updated relevant tests
• [ ] updated relevant documentation
• [ ] updated relevant milestone(s)
• [x] added relevant label(s)

[codecov[bot]]

Codecov Report

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

Project coverage is 84.32%. Comparing base (2112773) to head (b47feda). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #280 +/- ## ======================================= Coverage 84.32% 84.32% ======================================= Files 41 41 Lines 7529 7529 ======================================= Hits 6349 6349 Misses 1180 1180 ```

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