dns/unbound: Update to 1.16.0

This release has EDE support, for extended EDNS error reporting,
it fixes unsupported ZONEMD algorithms to load, and has more bug fixes.

The EDE errors can be turned on by ede: yes, it is default disabled.
Validation errors and other errors are then reported. If you also want
stale answers for expired responses to have an error code, the option
ede-serve-expired: yes can be used.

On request, the port now also has dnscrypt support default enabled.

PR: 264538