bind: 9.12.4-P1 -> 9.14.2

9.12 is EOL as of May 2019.

9.14.2 release notes (which appear to extend those for 9.14.1):

https://ftp.isc.org/isc/bind9/9.14.2/RELEASE-NOTES-bind-9.14.2.html

Please check the security fixes and prioritize this as appropriate.