[CRITICAL VULNERABILITY]: Form-data Dependency

[kudretyilmazz]

What happened?

Dear Onesignal team, are you still alive?

Please update the relevant dependency to the latest version.

GHSA-fjxv-7rqg-78g4

[sherwinski]

Hey there @kudretyilmazz, still alive and kicking 😄

This was already addressed in #136 and published in https://github.com/OneSignal/onesignal-node-api/releases/tag/5.2.1-beta1 so please update to the latest version to use the secured version.