Forcibly install dnf for FEDORA-2023-5fd964c1bf
    
    Per https://bodhi.fedoraproject.org/updates/FEDORA-2023-5fd964c1bf#comment-3149533
    we kinda need to do this to allow this update through, so long as
    we're not going to have dnf obsolete dnf5 or anything like that.
    It's a bit unfortunate but I don't see an alternative.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>