update postgres version in templates

tools/compose/nginx-proxy-manager.yml

@@ -6,7 +6,7 @@ version: "3.8"
 services:
   # Database (Postgres)
   postgres:
-    image: postgres:15-alpine
+    image: postgres:16-alpine
     restart: unless-stopped
     volumes:
       - postgres_data:/var/lib/postgresql/data