chore(deps): update postgres docker tag to v18 (#128)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

playground/docker/docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   zstart_postgres:
-    image: postgres:17.6-alpine
+    image: postgres:18.0-alpine
     shm_size: 1g
     user: postgres
     restart: always