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Hmm... should we only do this when we bump Cython in pyproject.toml ? And we shouldn't do the bump in backport for v5.3.x.

IDK. You're right that this doesn't impact our supported version of Cython.

Cython 3 was only released 2 months ago. When should we bump it, @astropy/astropy-project-release-team ?

I think we should use Cython 3 for 6.0, it may also be better for Numpy 2.0 support. See #15402

@saimn Is this needed any more now that #15402 is merged?

@nstarman - your commit was included in #15402 so can be closed.