chore(deps-dev): bump happy-dom from 20.3.4 to 20.8.9

Bumps [happy-dom](https://github.com/capricorn86/happy-dom) from 20.3.4 to 20.8.9.
- [Release notes](https://github.com/capricorn86/happy-dom/releases)
- [Commits](capricorn86/happy-dom@v20.3.4...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]

frontend/package.json

@@ -115,7 +115,7 @@
     "eslint-plugin-storybook": "^0.11.6",
     "eslint-plugin-vue": "^10.7.0",
     "eslint-plugin-vuejs-accessibility": "^2.4.1",
-    "happy-dom": "^20.3.4",
+    "happy-dom": "^20.8.9",
     "husky": "^9.1.7",
     "lint-staged": "^16.2.7",
     "nuxt-echarts": "^1.0.1",