Bump vue-router from 3.5.4 to 3.6.5 in /frontend

Bumps [vue-router](https://github.com/vuejs/router) from 3.5.4 to 3.6.5.
- [Release notes](https://github.com/vuejs/router/releases)
- [Commits](https://github.com/vuejs/router/commits)

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

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

frontend/package.json

@@ -18,7 +18,7 @@
     "vue-clipboard2": "^0.3.3",
     "vue-i18n": "^8.27.1",
     "vue-json-viewer": "^2.2.22",
-    "vue-router": "^3.5.3",
+    "vue-router": "^3.6.5",
     "vue-socket.io": "^3.0.10"
   },
   "devDependencies": {