chore(deps): update postgres docker tag to v16.11

Author: renovate[bot]

stack/docker-compose.yml

@@ -121,7 +121,7 @@ services:
       retries: 120
 
   postgres:
-    image: postgres:16.6-alpine3.21
+    image: postgres:16.11-alpine3.21@sha256:9ed02337f0d52b7ce97d7f89120a2305af10ae1da42d4542c21d942f14ee52ea
     environment:
       - POSTGRES_DB=dave-db
       - POSTGRES_USER=dave