dnf5 is currently in Fedora only, but this manifest is shared with
CentOS Stream and RHEL. Instead of requesting `dnf5`, request
`/usr/bin/dnf` instead. This will pull in dnf5 on Fedora, but dnf(4)
elsewhere.
We should be able to simplify this back to just `dnf` eventually once
dnf v4 is out of Fedora.