feat(container)!: Update docker.io/library/postgres Docker tag (17.7 → 18.1)

| datasource | package                    | from | to   |
| ---------- | -------------------------- | ---- | ---- |
| docker     | docker.io/library/postgres | 17.7 | 18.1 |

Author: erhardt-consulting-bot

postgres/verein.Dockerfile

@@ -1,4 +1,4 @@
-FROM docker.io/library/postgres:17.7@sha256:7352e0c4d62bbac8aa69d95e40220a60967c4a19f9c4f65b4d118175f7ce9e3b
+FROM docker.io/library/postgres:18.1@sha256:f42fe58fa146f29072559fcb855cc2e93e2c9ab08c1cbe7c5db4973d665e3d86
 
 # Set default admin password (hftm_admin)
 ENV POSTGRES_PASSWORD=hftm_admin