chore(deps-dev): bump happy-dom in /packages/ui-mocks

Bumps [happy-dom](https://github.com/capricorn86/happy-dom) from 15.7.4 to 20.8.9.
- [Release notes](https://github.com/capricorn86/happy-dom/releases)
- [Commits](capricorn86/happy-dom@v15.7.4...v20.8.9)

---
updated-dependencies:
- dependency-name: happy-dom
  dependency-version: 20.8.9
  dependency-type: direct:development
...

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

Author: dependabot[bot]

packages/ui-mocks/package.json

@@ -21,7 +21,7 @@
     "@testing-library/react": "16.0.1",
     "@types/react": "18.3.12",
     "@types/react-dom": "18.3.1",
-    "happy-dom": "15.7.4",
+    "happy-dom": "20.8.9",
     "typescript": "5.6.3",
     "vitest": "2.1.4"
   }