Inspect compatibility with Numpy 2.0

[PGijsbers]

NumPy 2.0 is going to be released "soon". This timeline sets a rc next month and a proper release a month or two later. It features breaking changes. I don't know if we will be affected, but if so we should either work on compatibility or (temporary) make sure to add an upperbound.

Labeling this as a priority, because I think we should work under the assumption that things will break unless tested.