Fix remove-unused-fields in CI

[DZakh]

I've started working on updating the node version in CI from 14 to 16.
But the lint script started failing because of rescript-relay-cli remove-unused-fields --ci --verbose exiting with code 1.
Here's the error with debug on:

After looking at the source code, several hours of different tries, and multiple wild guesses, I've found the solution. It worked fine before because the npx with node@14 doesn't have the prompt.

For some reason, I couldn't reproduce the error locally and only in CI, but I've tested the fix using https://pnpm.io/cli/patch, and it solved the problem.

[zth]

Haha, sorry you had to go through that! 😬😃 Thanks for the fix! Would you also add it to the changelog?

[DZakh]

Done