Bump TypeScript version in with-typescript (#40924)

Bumps the version for the legacy `with-typescript` example as it's
behind our recommended TypeScript version. We can investigate aliasing
this example to the default template in a follow-up.

## Documentation / Examples

- [x] Make sure the linting passes by running `pnpm lint`
- [ ] The "examples guidelines" are followed from [our contributing
doc](https://github.com/vercel/next.js/blob/canary/contributing/examples/adding-examples.md)

x-ref:
#40863 (comment)

examples/with-typescript/package.json

@@ -15,6 +15,6 @@
     "@types/node": "^12.12.21",
     "@types/react": "^17.0.2",
     "@types/react-dom": "^17.0.1",
-    "typescript": "4.0"
+    "typescript": "^4.8.3"
   }
 }