Update engines to node >=10 (#28174)
Update engines to node >=10 (#28174)

Summary:
v8 dropped out of LTS support, updating the package.json engines to node v10.

## Changelog

[General] [Changed] - Bump supported Node engines to >= 10
Pull Request resolved: https://github.com/facebook/react-native/pull/28174

Reviewed By: cpojer

Differential Revision: D20107977

Pulled By: hramos

fbshipit-source-id: 795cce79eb32f34e19d20bb8684b898b26e07228

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