Add postgres to service dependencies

group_vars/matrix_servers

@@ -1075,6 +1075,8 @@ matrix_bot_maubot_systemd_required_services_list: |
     +
     ['matrix-' + matrix_homeserver_implementation + '.service']
     +
+    (['matrix-postgres.service'] if matrix_postgres_enabled else [])
+    +
     (['matrix-nginx-proxy.service'] if matrix_nginx_proxy_enabled else [])
   }}