SDK references pinned versions of React, causing duplicate dependencies

[jordaaash]

https://github.com/KeystoneHQ/keystone-airgaped-base/blob/67cadb8af7207adfa5de20094dc82c8cfb00831a/packages/sdk/package.json#L30-L55

This code pins the version of React + DOM to 16.13.1. Any React app that uses this library will end up with two versions of these dependencies, causing bundle bloat and other issues.

Additionally the dev dependencies of the same packages use newer versions, and are unpinned.

React applications should provide their own version of React, and libraries that need it should declare flexible peer dependencies and dev dependencies instead.

[peterpme]

Hi @zhaomengru2015, is it possible to merge this in? Thank you