temporarily point to gwcs main

[nden]

Resolves JP-nnnn
Resolves RCAL-nnnn

Closes #

This PR addresses ...

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 regression tests with this branch installed ("git+https://github.com/<fork>/stcal@<branch>")
    • jwst regression test
    • romancal regression test

news fragment change types...

• changes/<PR#>.apichange.rst: change to public API
• changes/<PR#>.bugfix.rst: fixes an issue
• changes/<PR#>.general.rst: infrastructure or miscellaneous change

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.88%. Comparing base (728b877) to head (80d6d6a).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #322       +/-   ##
===========================================
+ Coverage   29.56%   86.88%   +57.32%     
===========================================
  Files          37       49       +12     
  Lines        8332     8937      +605     
===========================================
+ Hits         2463     7765     +5302     
+ Misses       5869     1172     -4697     

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