Bump vuetify from 3.5.15 to 3.6.11 in /frontend

Bumps [vuetify](https://github.com/vuetifyjs/vuetify/tree/HEAD/packages/vuetify) from 3.5.15 to 3.6.11.
- [Release notes](https://github.com/vuetifyjs/vuetify/releases)
- [Commits](https://github.com/vuetifyjs/vuetify/commits/v3.6.11/packages/vuetify)

---
updated-dependencies:
- dependency-name: vuetify
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -84,7 +84,7 @@
     "vite": "^5.2.12",
     "vue": "3.4.27",
     "vue-i18n": "^9.13.1",
-    "vuetify": "^3.5.15"
+    "vuetify": "^3.6.11"
   },
   "devDependencies": {
     "@eslint-community/eslint-plugin-eslint-comments": "^4.3.0",