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

[yaffs-website] / web / core / modules / taxonomy / tests / modules / vocabulary_serialization_test / vocabulary_serialization_test.info.yml

name: 'Vocabulary serialization test'
type: module
package: Testing
version: VERSION
core: 8.x
dependencies:
  - drupal:taxonomy