Bump zod and next in /dashboard

Removes [zod](https://github.com/colinhacks/zod). It's no longer used after updating ancestor dependency [next](https://github.com/vercel/next.js). These dependencies need to be updated together.


Removes `zod`

Updates `next` from 13.4.19 to 13.5.4
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v13.4.19...v13.5.4)

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

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

dashboard/package.json

@@ -21,7 +21,7 @@
     "axios": "^1.5.0",
     "eslint": "8.48.0",
     "eslint-config-next": "13.4.19",
-    "next": "13.4.19",
+    "next": "13.5.4",
     "postcss": "8.4.31",
     "react": "18.2.0",
     "react-dom": "18.2.0",