Adjust configs for SwitchToDnf5 Change

dnf5 (in obsoleting-dnf mode) provides /usr/bin/yum and obsoletes
yum, so we should drop the 'dnf-yum' entries (which installed
yum). dnf5 also appears to provide and obsolete microdnf, so we
should replace microdnf with dnf5 in the minimal image, I guess.
dnf5-plugins seems the logical replacement for dnf-plugins-core
(which is not removed yet, but is specific to dnf4).

Signed-off-by: Adam Williamson <awilliam@redhat.com>

teams/cloud/vagrant.xml

@@ -58,7 +58,6 @@
 		<user password="$1$wYJUgpM5$RXMMeASDc035eX.NbYWFl0" home="/root" name="root" groups="root"/>
 	</users>
 	<packages type="image" patternType="plusRecommended" profiles="VagrantCore">
-		<package name="dnf-yum"/>
 		<package name="rsync"/>
 		<package name="fuse-sshfs"/>
 		<package name="gdisk"/>