chore(deps): update grafana/loki docker tag to v3.6.6

Author: renovate[bot]

software/roles/docker_compose_apps/templates/observability/docker-compose.yml

@@ -42,7 +42,7 @@ services:
       - internal
 
   loki:
-    image: grafana/loki:3.1.1
+    image: grafana/loki:3.6.6
     command: [ "-config.file=/etc/loki/local-config.yaml" ]
     restart: unless-stopped
     read_only: true