Upgrade Postgres (v18.1-3 -> v18.1-4)

requirements.yml

@@ -50,7 +50,7 @@
   version: dd6e15246b7a9a2d921e0b3f9cd8a4a917a1bb2f
   name: playbook_state_preserver
 - src: git+https://github.com/mother-of-all-self-hosting/ansible-role-postgres.git
-  version: v18.1-3
+  version: v18.1-4
   name: postgres
 - src: git+https://github.com/mother-of-all-self-hosting/ansible-role-postgres-backup.git
   version: v18-0