Deprecated action buttons in node form

Since the 8.4 release, following the work on #2068063: Change "Save and keep un-/published" buttons to a "Published" checkbox and an included "Save" button, there's no longer a 'publish' button in node edit forms.
Rabbithole still references the old button in rh_node/src/Plugin/RabbitHoleEntityPlugin/Node.php, and by doing so triggers a warning when an user displays the node edit form.

class Node extends RabbitHoleEntityPluginBase {
  /**
   * {@inheritdoc}
   */
  public function getFormSubmitHandlerAttachLocations() {
    return [
      ['actions', 'submit', '#submit'],
      ['actions', 'publish', '#submit'],
    ];
  }
}

I'm currently working on a patch.