Upgrade Postgres (v17.6-7 -> v18.0-0)

Ref:
- d00258c03d
- 1a60318553

requirements.yml

@@ -43,7 +43,7 @@
   version: ff2fd42e1c1a9e28e3312bbd725395f9c2fc7f16
   name: playbook_state_preserver
 - src: git+https://github.com/mother-of-all-self-hosting/ansible-role-postgres.git
-  version: v17.6-7
+  version: v18.0-0
   name: postgres
 - src: git+https://github.com/mother-of-all-self-hosting/ansible-role-postgres-backup.git
   version: v17-8