mkosi: Add CentOS Stream 9
The blocker causing Stream 9 builds to fail was fixed (https://bugzilla.redhat.com/show_bug.cgi?id=2056276) so we can add CentOS Stream 9 builds as well now.
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The blocker causing Stream 9 builds to fail was fixed (https://bugzilla.redhat.com/show_bug.cgi?id=2056276) so we can add CentOS Stream 9 builds as well now.