Remove quad9 DNS server

Author: mrnicegyu11

services/monitoring/docker-compose.yml.j2

@@ -331,7 +331,7 @@ services:
     image: ghcr.io/albertodonato/query-exporter:sha-a1d908e
     volumes: []
     dns:
-      - 9.9.9.9
+      - 8.8.8.8
       - 1.1.1.1
     configs:
       - source: pgsql_query_exporter_config