fix(deps): bump @mdi/js from 5.9.55 to 6.7.96 in /frontend (#1279)

Bumps [@mdi/js](https://github.com/Templarian/MaterialDesign-JS) from 5.9.55 to 6.7.96.
- [Release notes](https://github.com/Templarian/MaterialDesign-JS/releases)
- [Commits](https://github.com/Templarian/MaterialDesign-JS/compare/v5.9.55...v6.7.96)

---
updated-dependencies:
- dependency-name: "@mdi/js"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

frontend/package.json

@@ -15,7 +15,7 @@
   },
   "dependencies": {
     "@adapttive/vue-markdown": "^4.0.1",
-    "@mdi/js": "^5.9.55",
+    "@mdi/js": "^6.7.96",
     "@nuxtjs/auth-next": "5.0.0-1624817847.21691f1",
     "@nuxtjs/axios": "^5.13.6",
     "@nuxtjs/i18n": "^7.0.3",