Updated Drupal to 8.6. This goes with the following updates because it's possible...

[yaffs-website] / web / core / modules / media / config / optional / system.action.media_publish_action.yml

langcode: en
status: true
dependencies:
  module:
    - media
id: media_publish_action
label: 'Publish media'
type: media
plugin: entity:publish_action:media
configuration: {  }