dns/bind916: update to 9.16.28
BIND9 9.16 is now the new ESV release, replacing BIND9 9.11.
Changes: https://downloads.isc.org/isc/bind9/9.16.28/doc/arm/html/notes.html#notes-for-bind-9-16-28
(cherry picked from commit a61f9745ccf4134228fc8aee97dfd35d07f98fda)