chore(deps-dev): bump ember-qunit from 5.1.5 to 6.2.0

Bumps [ember-qunit](https://github.com/emberjs/ember-qunit) from 5.1.5 to 6.2.0.
- [Release notes](https://github.com/emberjs/ember-qunit/releases)
- [Changelog](https://github.com/emberjs/ember-qunit/blob/v6.2.0/CHANGELOG.md)
- [Commits](emberjs/ember-qunit@v5.1.5...v6.2.0)

---
updated-dependencies:
- dependency-name: ember-qunit
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -70,7 +70,7 @@
     "ember-load-initializers": "~2.1.2",
     "ember-modifier": "~4.1.0",
     "ember-page-title": "~7.0.0",
-    "ember-qunit": "~5.1.5",
+    "ember-qunit": "~6.2.0",
     "ember-resolver": "~10.1.1",
     "ember-source": "~5.1.2",
     "ember-source-channel-url": "~3.0.0",