771cae0903
mailmanPackages.hyperkitty was marked transiently broken, since it
depends on django-q, even though its Python package set overrides
redis to a verison compatible with django-q.
At the same time, hiredis was moved to being an optional dependency of
django-redis. It's required by django-q, so use it here.
Fixes: 5cebbd4be4 ("python311Packages.django-q: mark as broken")