resolve: add reference of the original bus message to the aux queries

Otherwise, the error in aux queries cannot be replied.

Fixes #22477.

src/resolve/resolved-bus.c

@@ -1137,6 +1137,7 @@ static int resolve_service_hostname(DnsQuery *q, DnsResourceRecord *rr, int ifin
         if (r < 0)
                 return r;
 
+        aux->bus_request = sd_bus_message_ref(q->bus_request);
         aux->request_family = q->request_family;
         aux->complete = resolve_service_hostname_complete;