Fix infty

[rjleveque]

To fix

AttributeError: `np.infty` was removed in the NumPy 2.0 release. Use `np.inf` instead.

[mandli]

I think these are fixed in #642 along with some other instances of the same. If we do not merge in all of the tests, there are a few other changes to the Python packages that correct bugs and make the flake call pass.

[rjleveque]

I don't see these fixes in #642, maybe somewhere else?

[mandli]

Huh, you are right. Must have been because it was in a function call and it was not checking the imports. I have fixed this in other spots, but best to merge this in then.