[no-test]: Bump qunit from 2.19.0 to 2.20.0

Bumps [qunit](https://github.com/qunitjs/qunit) from 2.19.0 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@2.19.0...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>

package.json

@@ -46,7 +46,7 @@
  "gettext-parser": "7.0.1",
  "htmlparser": "1.7.7",
  "jed": "1.1.1",
- "qunit": "2.19.0",
+ "qunit": "2.20.0",
  "qunit-tap": "1.5.1",
  "sass": "1.59.3",
  "sizzle": "2.3.5",