Add rhel-9 and rhel-9-unknown entries
There's no date for RHEL-9 alpha release, but it's publicly known RHEL-9 is a thing.
Based on that, let's add its entry, rhel-9-unknown entry, and also adjust rhel-unknown accordingly.
There's no date for RHEL-9 alpha release, but it's publicly known RHEL-9 is a thing.
Based on that, let's add its entry, rhel-9-unknown entry, and also adjust rhel-unknown accordingly.