chore(deps-dev): bump qunit from 2.20.1 to 2.21.0

Bumps [qunit](https://github.com/qunitjs/qunit) from 2.20.1 to 2.21.0.
- [Release notes](https://github.com/qunitjs/qunit/releases)
- [Changelog](https://github.com/qunitjs/qunit/blob/main/History.md)
- [Commits](qunitjs/qunit@2.20.1...2.21.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -74,7 +74,7 @@
     "eslint-plugin-qunit": "8.1.1",
     "loader.js": "4.7.0",
     "prettier": "3.3.2",
-    "qunit": "2.20.1",
+    "qunit": "2.21.0",
     "qunit-dom": "3.1.2",
     "semantic-release": "22.0.12",
     "stylelint": "15.11.0",