Ensure np.fix works on Masked data for numpy 1.25

[mhvk]

Fixes #14571

I have a somewhat better fix that implies an API change in the works, but that would be for the next version.

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[mhvk]

Now that I have #14590, this one should be for 5.2 and 5.0.6 only -- see #14591. So, I'll close this - we can reopen if this turns out to be a better solution.