chore(deps-dev): bump nuxt from 3.0.0-rc.8 to 3.0.0-rc.9 in /frontend

Bumps [nuxt](https://github.com/nuxt/nuxt.js) from 3.0.0-rc.8 to 3.0.0-rc.9.
- [Release notes](https://github.com/nuxt/nuxt.js/releases)
- [Changelog](https://github.com/nuxt/nuxt.js/blob/dev/RELEASE_PLAN.md)
- [Commits](https://github.com/nuxt/nuxt.js/commits)

---
updated-dependencies:
- dependency-name: nuxt
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

frontend/package.json

@@ -20,7 +20,7 @@
     "eslint-plugin-prettier": "^4.2.1",
     "eslint-plugin-vue": "^9.4.0",
     "isomorphic-fetch": "^3.0.0",
-    "nuxt": "3.0.0-rc.8",
+    "nuxt": "3.0.0-rc.9",
     "prettier": "^2.7.1",
     "typescript": "^4.8.3",
     "vite-plugin-eslint": "^1.8.1",