Improve compatibility with numpy 2.0

[mcara]

Fixes deprecation warnings related to computing cross product of 2D vectors using numpy.cross with numpy >= 2.0.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.28%. Comparing base (eb9d316) to head (c58b4db).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
gwcs/region.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #510      +/-   ##
==========================================
- Coverage   87.28%   87.28%   -0.01%     
==========================================
  Files          22       21       -1     
  Lines        3821     3813       -8     
==========================================
- Hits         3335     3328       -7     
+ Misses        486      485       -1     

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