Package build fails due to removal of setuptools.package_index

[snbianco]

The setuptools.package_index module was removed in v80.3.0 of setuptools.

Attempting to install astroquery from source using pip install git+https://github.com/astropy/astroquery produces the following error:

File "/private/var/folders/n4/_80pfrl53zn5gt7l7c6hdp0c0005t6/T/pip-req-build-2qwbwuy7/ah_bootstrap.py", line 56, in <module>
    from setuptools.package_index import PackageIndex
ModuleNotFoundError: No module named 'setuptools.package_index'

The offending line is here:

astroquery/ah_bootstrap.py

Line 56 in 1d76138

from setuptools.package_index import PackageIndex

[bsipocz]

xref pypa/setuptools#4963