ci: Bump rpm-ostree tag we build for tests
ci: Bump rpm-ostree tag we build for tests

The latest rpm-ostree release no longer requires `python3-devel` so `dnf
builddep` here is no longer pulling it in, subsequently causing issues
when building an older rpm-ostree release. Let's just bump the release
tag so we don't have to also start keeping track of older dependencies.

Closes: #1708
Approved by: cgwalters

GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree