Fix saturation flag issue for numpy 2+ in romancal

[WilliamJamieson]

The saturation step fails in stcal when running using numpy 2+. This appears to be caused by the use of an IntEnum by Roman instead of a dictionary. I believe this might be due to a numpy bug reported in numpy/numpy#27540.

In the mean time, the easiest fix is to cast the values directly to python int even though the IntEnum members should be python int values. In theory, this should be a totally transparent change to all code except on numpy 2+ when passing an IntEnum, in which case it simply strips the Enum related bits of the integer.

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 86.23%. Comparing base (60bd3b8) to head (c9b926c).
Report is 50 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
+ Coverage   86.21%   86.23%   +0.02%     
==========================================
  Files          47       47              
  Lines        8812     8826      +14     
==========================================
+ Hits         7597     7611      +14     
  Misses       1215     1215              

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[schlafly]

LGTM, thanks William.