build(deps-dev): bump qunit from 2.19.4 to 2.20.0

Bumps [qunit](https://github.com/qunitjs/qunit) from 2.19.4 to 2.20.0.
- [Release notes](https://github.com/qunitjs/qunit/releases)
- [Changelog](https://github.com/qunitjs/qunit/blob/main/History.md)
- [Commits](qunitjs/qunit@2.19.4...2.20.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Pull Request: #502
Change-Id: Iedb6c38254e3fb43bab1df241c7de81c4eb41bb0

package.json

@@ -86,7 +86,7 @@
     "http-server": "^14.1.1",
     "karma-qunit": "^4.1.2",
     "load-grunt-tasks": "^5.1.0",
-    "qunit": "^2.19.4",
+    "qunit": "^2.20.0",
     "sinon": "^15.2.0",
     "stylelint": "^15.10.3",
     "stylelint-config-wikimedia": "^0.16.1"