Bump ember-qunit from 5.1.5 to 6.1.1

Bumps [ember-qunit](https://github.com/emberjs/ember-qunit) from 5.1.5 to 6.1.1.
- [Release notes](https://github.com/emberjs/ember-qunit/releases)
- [Changelog](https://github.com/emberjs/ember-qunit/blob/master/CHANGELOG.md)
- [Commits](emberjs/ember-qunit@v5.1.5...v6.1.1)

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

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

Author: dependabot[bot]

package.json

@@ -57,7 +57,7 @@
     "ember-export-application-global": "^2.0.1",
     "ember-load-initializers": "^2.1.2",
     "ember-maybe-import-regenerator": "^1.0.0",
-    "ember-qunit": "^5.1.4",
+    "ember-qunit": "^6.1.1",
     "ember-resolver": "^10.0.0",
     "ember-source": "~3.28.0",
     "ember-source-channel-url": "^3.0.0",