Update to 9.16.29
    
    Previously, CDS and CDNSKEY DELETE records were removed from
    the zone when configured with the auto-dnssec maintain; option.
    This has been fixed. [GL #2931]
    
    https://downloads.isc.org/isc/bind9/9.16.29/doc/arm/html/notes.html#notes-for-bind-9-16-29
    
    Resolves: rhbz#2087920