Upgrade com.devture.ansible.role.postgres

The new version uses the corresponding container image when running
vacuum, not the latest Postgres version.

requirements.yml

@@ -19,7 +19,7 @@
   version: ff2fd42e1c1a9e28e3312bbd725395f9c2fc7f16
 
 - src: git+https://github.com/devture/com.devture.ansible.role.postgres.git
-  version: e75973e3a4edc12dfc3e880e43b12ebecbf82c61
+  version: 867b5b083f48d75c2fb64eb20c9d65e119d02cfd
 
 - src: git+https://github.com/devture/com.devture.ansible.role.postgres_backup.git
   version: 77b1f9ae1aafa31c9078178c1036bf744c99d08b