fix(deps): update dependency astropy-healpix to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
astropy-healpix	^1.0.0 → ^2.0.0

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Release Notes

astropy/astropy-healpix (astropy-healpix)

v2.0.0

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• Require Numpy >= 2.

• Wheel for win32 is no longer provided. Use wheel for win_amd64 instead.

• Fix incorrect return values of uniq_to_level_ipix near npix boundaries.

• The functions nside_to_level and uniq_to_level_ipix no longer raise
  exceptions for invalid input values. Instead, they return -1.

v1.1.3

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• Build wheels for free-threaded Python (3.14t).

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