support python 3.13

[braingram]

Update CI to test with python 3.13.

Tasks

• update or add relevant tests
• update relevant docstrings and / or docs/ page
• Does this PR change any API used downstream? (if not, label with no-changelog-entry-needed)
  • write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see below for change types)
  • run jwst regression tests with this branch installed ("git+https://github.com/<fork>/stdatamodels@<branch>")

news fragment change types...

• changes/<PR#>.feature.rst: new feature
• changes/<PR#>.bugfix.rst: fixes an issue
• changes/<PR#>.doc.rst: documentation change
• changes/<PR#>.removal.rst: deprecation or removal of public API
• changes/<PR#>.misc.rst: infrastructure or miscellaneous change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.55%. Comparing base (fd6be8d) to head (77fb58d).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #333   +/-   ##
=======================================
  Coverage   66.55%   66.55%           
=======================================
  Files         102      102           
  Lines        5456     5457    +1     
=======================================
+ Hits         3631     3632    +1     
  Misses       1825     1825           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.