Bump zod and next in /docs

Bumps [zod](https://github.com/colinhacks/zod) to 3.22.4 and updates ancestor dependency [next](https://github.com/vercel/next.js). These dependencies need to be updated together.


Updates `zod` from 3.21.4 to 3.22.4
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Changelog](https://github.com/colinhacks/zod/blob/master/CHANGELOG.md)
- [Commits](colinhacks/zod@v3.21.4...v3.22.4)

Updates `next` from 13.4.12 to 13.5.6
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v13.4.12...v13.5.6)

---
updated-dependencies:
- dependency-name: zod
  dependency-type: indirect
- dependency-name: next
  dependency-type: direct:production
...

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

docs/package.json

@@ -13,7 +13,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "next": "^13.4.10",
+    "next": "^13.5.6",
     "next-mdx-remote": "^4.4.1",
     "nextra": "^2.10.0",
     "nextra-theme-docs": "^2.10.0",