astropy v7.0: some removed functionality is used in tests

According to [astropy-integration-testing run](https://github.com/astropy/astropy-integration-testing/actions/runs/11785052451/job/32825493170), there is failure with stable version but not dev, so this package needs a new release to be compatible with `astropy` v7.0.0 (but *only* if you want the affected test to pass, not change to package functionality). FYI.

Start with the linked astropy-integration-testing run and identify the affected test and failure under stable astropy v7.0. Check the corresponding test and compatibility expectations in astroquery, then confirm that the stable integration test passes without changing package functionality; the issue indicates that a new release is needed.

Written by the indexing model from the issue text.