build(deps): bump nextra from 2.13.4 to 3.2.4 in /docs

Bumps [nextra](https://github.com/shuding/nextra) from 2.13.4 to 3.2.4.
- [Release notes](https://github.com/shuding/nextra/releases)
- [Commits](https://github.com/shuding/nextra/compare/[email protected]@3.2.4)

---
updated-dependencies:
- dependency-name: nextra
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

docs/package.json

@@ -5,7 +5,7 @@
     "@heroicons/react": "~2.1.5",
     "next": "~15.0.2",
     "next-themes": "~0.4.3",
-    "nextra": "~2.13.4",
+    "nextra": "~3.2.4",
     "nextra-theme-docs": "~2.13.4",
     "react": "~18.3.1",
     "react-dom": "~18.3.1",