Switch from devture_postgres_systemd_services_to_stop_for_maintenance_list to devture_postgres_systemd_services_to_stop_for_maintenance_list_auto

Only available since v16.0-2 of the Postgres role.

group_vars/matrix_servers

@@ -2959,7 +2959,7 @@ devture_postgres_gid: "{{ matrix_user_gid }}"
 devture_postgres_connection_username: matrix
 devture_postgres_db_name: matrix
 
-devture_postgres_systemd_services_to_stop_for_maintenance_list: "{{ devture_systemd_service_manager_services_list_auto | map(attribute='name') | reject('equalto', (devture_postgres_identifier + '.service')) }}"
+devture_postgres_systemd_services_to_stop_for_maintenance_list_auto: "{{ devture_systemd_service_manager_services_list_auto | map(attribute='name') | reject('equalto', (devture_postgres_identifier + '.service')) }}"
 
 devture_postgres_managed_databases_auto: |
   {{