chore(stacks): sync generated stacks for renovate update

Author: renovate[bot]

stacks/observability.yml

@@ -113,7 +113,7 @@ services:
         limits:
           memory: 512M
   loki:
-    image: grafana/loki:3.7.1
+    image: grafana/loki:3.7.2
     command: -config.file=/etc/loki/config.yaml
     volumes:
       - ./observability/loki/config.yaml:/etc/loki/config.yaml