chore(deps): update dependency @ember/test-helpers to v2.2.8 (#468)
chore(deps): update dependency @ember/test-helpers to v2.2.8 (#468)

Co-authored-by: Renovate Bot <c71e7261d37a4f6ae4cfb0cbd79081310a237e67@renovateapp.com>
tim-evans/ember-file-upload,tim-evans/ember-file-upload