Allow numpy 2

[ivirshup]

Fixes #1240

Unpinning numpy 2 since the test suite now runs fine with numpy 2.1.3.

[ivirshup]

Hmm, that didn't fail so badly locally. Will investigate further

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.94%. Comparing base (acfde71) to head (238b22f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1343      +/-   ##
==========================================
- Coverage   92.43%   91.94%   -0.49%     
==========================================
  Files          83       83              
  Lines        6739     6744       +5     
==========================================
- Hits         6229     6201      -28     
- Misses        510      543      +33     

Flag	Coverage Δ
unittests	91.94% <ø> (-0.49%)	⬇️

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