Bump nextra-theme-docs from 3.3.1 to 4.2.16

Bumps [nextra-theme-docs](https://github.com/shuding/nextra) from 3.3.1 to 4.2.16.
- [Release notes](https://github.com/shuding/nextra/releases)
- [Commits](https://github.com/shuding/nextra/compare/[email protected]@4.2.16)

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

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

Author: dependabot[bot]

package-lock.json

@@ -25,7 +25,7 @@
     "@vercel/analytics": "^1.4.1",
     "next": "^15.1.2",
     "nextra": "^3.3.1",
-    "nextra-theme-docs": "^3.3.1",
+    "nextra-theme-docs": "^4.2.16",
     "react": "^19.0.0",
     "react-dom": "^19.0.0"
   }