BUG: fix compatibility with numpy 2.0.0 (copy semantics)

[neutrinoceros]

There are a couple other failing tests with numpy 2 but this one is self contained.
I'll open a different PR for the rest.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.55%. Comparing base (b962f56) to head (2872944).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #824   +/-   ##
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  Coverage   97.55%   97.55%           
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  Files           9        9           
  Lines        1392     1392           
=======================================
  Hits         1358     1358           
  Misses         34       34           

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[neutrinoceros]

@mwcraig there's another patch for numpy 2 in #826
And I'm still seeing 3 failing tests locally, but they're about testing scripts and the only info we get from the tests is that the return value is non-zero. Debugging those will probably take a bit longer but I'm getting to it !

update: actually the error I was seeing with scripts had nothing to do with numpy. See #827