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@sha256:6a2fb9aaf22abf4c5aeeeb8fcd12dfb57b7531d8d5196f90cfe0ce3f68c4c13f
+FROM docker.io/library/postgres:18.1@sha256:bfe50b2b0ddd9b55eadedd066fe24c7c6fe06626185b73358c480ea37868024d
 
 # Set default admin password (hftm_admin)
 ENV POSTGRES_PASSWORD=hftm_admin