unbound: fix healthcheck logging + added fail tolerance to checks (#6004)

* unbound: fix healthcheck logging to stdout + rewrote healthcheck logic

* compose: bump unbound tag

* unbound: fixed healthcheck logic

docker-compose.yml

@@ -1,7 +1,7 @@
 services:
 
     unbound-mailcow:
-      image: mailcow/unbound:1.22
+      image: mailcow/unbound:1.23
       environment:
         - TZ=${TZ}
         - SKIP_UNBOUND_HEALTHCHECK=${SKIP_UNBOUND_HEALTHCHECK:-n}