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

data/Dockerfiles/unbound/stop-supervisor.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+printf "READY\n";
+
+while read line; do
+  echo "Processing Event: $line" >&2;
+  kill -3 $(cat "/var/run/supervisord.pid")
+done < /dev/stdin
+
+rm -rf /tmp/healthcheck_status