[SCSB-170] pin Python<3.13

[zacharyburnett]

Resolves SCSB-170

Checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.32%. Comparing base (2112773) to head (b47feda).
Report is 177 commits behind head on main.

Additional details and impacted files

@@           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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[schlafly]

LGTM, thanks Zach.