🌿 fix compile

[dsinghvi]

Fern's TypeScript generator version 0.8.x onwards relies on qs but before then we relied on URLSearchParams.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}