This commit is a bit deceitful: The main change in the image is *not* the
more recent Fedora base, but an updated (and not backward-compatible)
evolution-data-server package from the fmuellner/gnome-shell-ci copr.

gnome-shell!501 ports
gnome-shell to the new API, so to keep mutter and gnome-shell CI
working after that change, we need to build against the correct
EDS version.

!582