Bump @ember/test-helpers from 2.2.8 to 2.2.9 (#824)
Bump @ember/test-helpers from 2.2.8 to 2.2.9 (#824)

Bumps [@ember/test-helpers](https://github.com/emberjs/ember-test-helpers) from 2.2.8 to 2.2.9.
- [Release notes](https://github.com/emberjs/ember-test-helpers/releases)
- [Changelog](https://github.com/emberjs/ember-test-helpers/blob/master/CHANGELOG.md)
- [Commits](https://github.com/emberjs/ember-test-helpers/compare/v2.2.8...v2.2.9)

---
updated-dependencies:
- dependency-name: "@ember/test-helpers"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
rwwagner90/ember-shepherd,shipshapecode/ember-shepherd,shipshapecode/ember-shepherd,rwwagner90/ember-shepherd