Ensure test_npsupport passes with numpy>=2.0.0 by explicitly setting dtype=numpy.int32.

[junkmd]

Fixes #573

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.35%. Comparing base (2084e47) to head (9b80880).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #859   +/-   ##
=======================================
  Coverage   83.35%   83.35%           
=======================================
  Files         123      123           
  Lines       11300    11300           
=======================================
  Hits         9419     9419           
  Misses       1881     1881           

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