fix(deps): bump @nuxtjs/auth-next in /frontend (#1265)

Bumps [@nuxtjs/auth-next](https://github.com/nuxt-community/auth-module) from 5.0.0-1624817847.21691f1 to 5.0.0-1648802546.c9880dc.
- [Release notes](https://github.com/nuxt-community/auth-module/releases)
- [Changelog](https://github.com/nuxt-community/auth-module/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/nuxt-community/auth-module/commits)

---
updated-dependencies:
- dependency-name: "@nuxtjs/auth-next"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

frontend/package.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "@adapttive/vue-markdown": "^4.0.1",
     "@mdi/js": "^5.9.55",
-    "@nuxtjs/auth-next": "5.0.0-1624817847.21691f1",
+    "@nuxtjs/auth-next": "5.0.0-1648802546.c9880dc",
     "@nuxtjs/axios": "^5.13.6",
     "@nuxtjs/i18n": "^7.0.3",
     "@nuxtjs/proxy": "^2.1.0",