Эта версия исправляет ошибки найденные в предыдущей версии.
/**
* Allow test modules and themes to be installed.
*
* Drupal ignores test modules and themes by default for performance reasons.
* During development it can be useful to install test extensions for debugging
* purposes.
*/
$settings['extension_discovery_scan_tests'] = TRUE;
Заменено на:
/**
* Allow test modules and themes to be installed.
*
* Drupal ignores test modules and themes by default for performance reasons.
* During development it can be useful to install test extensions for debugging
* purposes.
*/
# $settings['extension_discovery_scan_tests'] = TRUE;
Пошаговое описание обновления системы до новой версии смотрите в документации.