chore(deps): bump next from 13.4.13 to 13.4.16 in /docs

Bumps [next](https://github.com/vercel/next.js) from 13.4.13 to 13.4.16.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v13.4.13...v13.4.16)

---
updated-dependencies:
- dependency-name: next
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

docs/package.json

@@ -7,7 +7,7 @@
   "dependencies": {
     "@types/gtag.js": "^0.0.13",
     "@vercel/analytics": "^1.0.2",
-    "next": "^13.4.13",
+    "next": "^13.4.16",
     "nextra": "^2.6.2",
     "nextra-theme-docs": "^2.6.2",
     "react": "^18.2.0",