Update Next.js version in api rate limits example (vercel#32326)

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `yarn lint`

examples/api-routes-rate-limit/package.json

@@ -7,7 +7,7 @@
   },
   "dependencies": {
     "lru-cache": "^6.0.0",
-    "next": "10.0.3",
+    "next": "latest",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
     "uuid": "^8.3.1"