chore(deps-dev): 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

@@ -44,7 +44,7 @@
     "@babel/eslint-parser": "7.25.8",
     "@babel/plugin-proposal-decorators": "7.25.7",
     "@ember/optional-features": "2.1.0",
-    "@ember/test-helpers": "3.3.1",
+    "@ember/test-helpers": "4.0.4",
     "@embroider/test-setup": "4.0.0",
     "@glimmer/component": "1.1.2",
     "broccoli-asset-rev": "3.0.0",