Update grafana/promtail Docker tag to v3.6.3 (#710)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

ansible/playbooks/grafana/docker-compose.yml

@@ -12,7 +12,7 @@ services:
     command: -config.file=/etc/loki/local-config.yaml
 
   promtail:
-    image: grafana/promtail:3.6.2
+    image: grafana/promtail:3.6.3
     container_name: promtail
     volumes:
       - /var/log:/var/log