unbound: Update version strings to 1.16.1

The last number of unbound upgrades failed to manually update the
version strings in usr.sbin/unbound/config.h. This commit fixes that.

Reported by: "Herbert J. Skuhra" <herbert@gojira.at>
Fixes: 0a92a9fca737edafbad03ee5a8efebe302851cff

		a39a5a6905612447def27b66ffe73b9d11efd80c
		9cf5bc93f6ba1711ae7bf96a982a2b3c8b073a18
		273016e836aa378789612e0a0e08d50f28be778e
		24e365220007c415f495cf8dcb228ece6002b8b7
		5469a9953005a9a4d4aad7be88545d441622e9a0

MFC after: 3 days