Bump nuxt from 2.15.8 to 3.12.4 in /scorecards-site

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] <[email protected]>

Author: dependabot[bot]

scorecards-site/package.json

@@ -33,7 +33,7 @@
     "core-js": "^3.19.3",
     "headroom.js": "^0.12.0",
     "highlight.js": "^11.4.0",
-    "nuxt": "^2.15.8",
+    "nuxt": "^3.12.4",
     "prism-themes": "^1.9.0",
     "prismjs": "^1.27.0",
     "rehype-add-classes": "^1.0.0",