Update react monorepo to v15.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
react (source)	15.6.2 -> 15.7.0
react-dom (source)	15.6.2 -> 15.7.0

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Release Notes

facebook/react

v15.7.0

Compare Source

React

• Backport support for the new JSX transform to 15.x. (@​lunaruan in #​18299 and @​gaearon in #​20024)

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