This ensures we don't add non-es5 code from ncc'ing
Fixes: https://github.com/vercel/next.js/issues/30450
## Bug
- [x] Related issues linked using `fixes #number`
- [x] Integration tests added
- [x] Errors have helpful link attached, see `contributing.md`
This prevents useless warnings about querystring.
```
warning next > native-url > querystring@0.2.1: The querystring API is considered Legacy. new code should use the URLSearchParams API instead.
warning next > node-libs-browser > url > querystring@0.2.0: The querystring API is considered Legacy. new code should use the URLSearchParams API instead.
```