feat(container)!: Update docker.io/library/postgres Docker tag (17 → 18)

| datasource | package                    | from | to |
| ---------- | -------------------------- | ---- | -- |
| docker     | docker.io/library/postgres | 17   | 18 |

Author: erhardt-consulting-bot

docker-compose.db.yaml

@@ -1,6 +1,6 @@
 services:
   database:
-    image: 'docker.io/library/postgres:17@sha256:6efd0df010dc3cb40d5e33e3ef84acecc5e73161bd3df06029ee8698e5e12c60'
+    image: 'docker.io/library/postgres:18@sha256:8a8bf9298b66169b43bb20a68c36852c9f917e3b5a6807afa343b636d760ef21'
     ports:
       - "5432:5432"
     environment: