Code review comment for ~chad.smith/ubuntu/+source/ubuntu-release-upgrader:uru-focal-ubuntu-advantage

Because 1:20.04.27 did exist in the archive, although it was only in -proposed, it is possible that it is installed on user's systems. Subsequently, we need to use a version greater than it so those users will get the fixes we are making. (I realize that is less true because we are changing the dist-upgrader tarball but still we should use best practices here.)