Bump happy-dom from 20.8.3 to 20.8.9 in /frontend

Bumps [happy-dom](https://github.com/capricorn86/happy-dom) from 20.8.3 to 20.8.9.
- [Release notes](https://github.com/capricorn86/happy-dom/releases)
- [Commits](https://github.com/capricorn86/happy-dom/compare/v20.8.3...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>

frontend/package.json

@@ -52,7 +52,7 @@
 		"@types/react-dom": "^19.2.3",
 		"@types/react-table": "^7.7.20",
 		"@vitejs/plugin-react": "^5.1.4",
-		"happy-dom": "^20.8.3",
+		"happy-dom": "^20.8.9",
 		"postcss": "^8.5.8",
 		"postcss-simple-vars": "^7.0.1",
 		"sass": "^1.97.3",