chore(deps): bump nuxt from 2.15.8 to 3.12.4 in /docs/v3

Bumps [nuxt](https://github.com/nuxt/nuxt/tree/HEAD/packages/nuxt) from 2.15.8 to 3.12.4.
- [Release notes](https://github.com/nuxt/nuxt/releases)
- [Commits](https://github.com/nuxt/nuxt/commits/v3.12.4/packages/nuxt)

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

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

Author: dependabot[bot]

docs/v3/package.json

@@ -11,6 +11,6 @@
     },
     "dependencies": {
         "docus": "^0.5.14",
-        "nuxt": "^2.15.6"
+        "nuxt": "^3.12.4"
     }
 }