Update grafana/loki Docker tag to v3

Author: renovate[bot]

logging/loki/docker-compose.yml

@@ -2,7 +2,7 @@ version: '2.4'
 
 services:
   loki:
-    image: grafana/loki:2.8.11
+    image: grafana/loki:3.7.1
     volumes:
       - ./configs:/etc/loki
     command: "-config.file=/etc/loki/config.yaml -config.expand-env=true"