chore(deps): bump nuxt from 3.20.1 to 3.21.6 in /desktop/main (#416)

Bumps [nuxt](https://github.com/nuxt/nuxt/tree/HEAD/packages/nuxt) from 3.20.1 to 3.21.6.
- [Release notes](https://github.com/nuxt/nuxt/releases)
- [Commits](https://github.com/nuxt/nuxt/commits/v3.21.6/packages/nuxt)

---
updated-dependencies:
- dependency-name: nuxt
  dependency-version: 3.21.6
  dependency-type: direct:production
...

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desktop/main/package.json

@@ -22,7 +22,7 @@
     "koa": "^2.16.1",
     "markdown-it": "^14.1.0",
     "micromark": "^4.0.1",
-    "nuxt": "^3.16.0",
+    "nuxt": "^3.21.6",
     "scss": "^0.2.4",
     "vue-router": "latest",
     "vuedraggable": "^4.1.0"