pin numpy<2

[braingram]

Numpy 2.0 is out.

OpenCV is not numpy 2.0 compatible (see opencv/opencv-python#943) causing many failures for stcal:
https://github.com/spacetelescope/stcal/actions/runs/9544922911/job/26304635960

This PR pins numpy to <2.

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 83.79%. Comparing base (af5aefb) to head (12699ec).
Report is 114 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #265      +/-   ##
==========================================
- Coverage   85.18%   83.79%   -1.39%     
==========================================
  Files          35       35              
  Lines        6797     6998     +201     
==========================================
+ Hits         5790     5864      +74     
- Misses       1007     1134     +127     

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