Summary: minor fix found in nightly logs from `Publish NPM` job (#43519)

Summary:
Minor fix to package.json which newer version of npm warn about when publishing, after running `npm pkg fix -ws` on the workspace.

{F1470070110}

## Changelog: [Internal] npm pkg fix -ws

Pull Request resolved: https://github.com/facebook/react-native/pull/43519

Test Plan: eyescloseddog

Reviewed By: cortinico

Differential Revision: D55012872

Pulled By: blakef

fbshipit-source-id: ff3c63a3eefaf56d369219a3d4b32d44d6d842c9