Symfony: setFactoryClass is deprecated, causes fatal when enabling the extension on Drupal8
action_provider_civicrm_container, the method
setFactoryClass is called, but this has been removed since Symfony 3.0 (I'm on Drupal8 with Symfony 3.x).
It causes a fatal when enabling the extension.
From reading this doc, I think we can replace with:
but I haven't really tested yet.
(form-processor has the same issue)