MarsSeed [1] filed a deletion request for pypy-six [2]:

This dual PyPy/PyPy3 package from 2021 is broken and unmaintained.

It is missing its pypy-setuptools makedepends.

The best course of action is to delete this pkgbase, and upload a new pypy3-six pkgbase, if someone wants to maintain such.

[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/pypy-six/