fix(deps): bump @nuxtjs/tailwindcss from 5.3.5 to 6.1.3 in /frontend

Bumps [@nuxtjs/tailwindcss](https://github.com/nuxt-community/tailwindcss-module) from 5.3.5 to 6.1.3.
- [Release notes](https://github.com/nuxt-community/tailwindcss-module/releases)
- [Changelog](https://github.com/nuxt-modules/tailwindcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/nuxt-community/tailwindcss-module/compare/v5.3.5...v6.1.3)

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

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

frontend/package.json

@@ -29,7 +29,7 @@
   },
   "dependencies": {
     "@iconify/vue": "^3.2.1",
-    "@nuxtjs/tailwindcss": "^5.3.2",
+    "@nuxtjs/tailwindcss": "^6.1.3",
     "@pinia/nuxt": "^0.4.1",
     "@tailwindcss/aspect-ratio": "^0.4.0",
     "@tailwindcss/forms": "^0.5.2",