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

[yaffs-website] / web / core / profiles / demo_umami / modules / demo_umami_content / demo_umami_content.info.yml

name: 'Umami demo: Content'
description: Imports the content for the Umami demo.
type: module
version: VERSION
core: 8.x
package: 'Core (Experimental)'
dependencies:
  - field
  - file
  - image
  - node
  - options
  - path
  - taxonomy
  - text
  - user