[FBR] Upgrade pagure in production

Good Morning,

A bit before freeze started, we upgrade pagure to 5.7.4 on src.fp.o but forgot to do pagure.io Since then there has been 4 small bug fixes releases (most of which are related to src.fp.o), changelog is at: https://docs.pagure.org/pagure/changelog.html

I'd like to upgrade src.fp.o from 5.7.4 to 5.7.8 which will also make Tomas Tomecek's life easier on packit and upgrade pagure.io to the latest version.

Down time for src.fp.o is as small as an apache restart, on pagure.io there is a database migration to apply but it should be just a few minutes.

Thoughts? Pierre