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Hmm, just saw that the sample log is in fact from a run introducing python 3.14 tests. In that case, perhaps worth checking after all which one is the problem.

Ah, that's a good point, I didn't consider this possibility.
I looked for recent changes in numpy and didn't find anything relevant, so it's likely the case that the real change was in Python.

I guess we need to try cp313 + numpy dev + windows then. Since I cannot do that locally, I'll open an exploratory PR instead.

Seems like you were right, numpy 2.4.0dev0 + Python 3.13 doesn't emit the warning either
https://github.com/astropy/astropy/actions/runs/15851477469/job/44685826184

I can easily adapt this PR with the more correct approach then

Sounds good, thanks.