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

[yaffs-website] / web / core / profiles / testing_config_import / testing_config_import.info.yml

name: 'Testing config import'
type: profile
description: 'Tests install profiles in the config importer.'
version: VERSION
core: 8.x
hidden: true
install:
  - syslog
themes:
  - stark