dns/knot3-lib: Fix pkg-plist after master upgrade

After commit 19c2289c66eba7a9a02ebd0862c5009ceb36f637
dns/knot3: upgrade to 3.2.0
the pkg-plist of the slave port must be updated as well.

Also bump PORTREVISION on consumer dns/knot-resolver.

PR: 265999
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D36308