Update selinux-policy minimal requirement
    
    Since 6c2710446718828e6840ac34ea6fc704ae6790db we need a new selinux
    policy in order to ensure /etc/named directory content has the correct
    selinux flags.
    
    Reviewed-By: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Alexander Bokovoy <abbra@users.noreply.github.com>