Bump @ember/test-helpers from 3.3.1 to 4.0.4

Bumps [@ember/test-helpers](https://github.com/emberjs/ember-test-helpers) from 3.3.1 to 4.0.4.
- [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/commits)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -112,7 +112,7 @@
     "@ember-data/store": "^5.3.9",
     "@ember/optional-features": "^2.2.0",
     "@ember/string": "^3.1.1",
-    "@ember/test-helpers": "^3.3.1",
+    "@ember/test-helpers": "^4.0.4",
     "@embroider/test-setup": "^3.0.3",
     "@fullhuman/postcss-purgecss": "^4.1.3",
     "@release-it-plugins/lerna-changelog": "^7.0.0",