Bump vue from 2.6.14 to 3.5.6 in /src/frontend

Bumps [vue](https://github.com/vuejs/core) from 2.6.14 to 3.5.6.
- [Release notes](https://github.com/vuejs/core/releases)
- [Changelog](https://github.com/vuejs/core/blob/main/CHANGELOG.md)
- [Commits](https://github.com/vuejs/core/commits/v3.5.6)

---
updated-dependencies:
- dependency-name: vue
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

src/frontend/package.json

@@ -28,7 +28,7 @@
     "nuxt": "^3.12.4",
     "nuxt-buefy": "^0.4.29",
     "sass-loader": "^10.1.1",
-    "vue": "^2.6.14",
+    "vue": "^3.5.6",
     "vue-router": "^3.5.3",
     "vue-server-renderer": "^2.6.14",
     "vue-template-compiler": "^2.6.14",