Update react monorepo to v16.7.0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change	References
react	devDependencies	minor	16.6.3 -> 16.7.0	homepage, source
react-dom	devDependencies	minor	16.6.3 -> 16.7.0	homepage, source

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Release Notes

facebook/react

v16.7.0

Compare Source

React DOM

• Fix performance of React.lazy for large numbers of lazily-loaded components. (@​acdlite in #​14429)
• Clear fields on unmount to avoid memory leaks. (@​trueadm in #​14276)
• Fix bug with SSR and context when mixing react-dom/server@16.6 and react@<16.6. (@​gaearon in #​14291)
• Fix a performance regression in profiling mode. (@​bvaughn in #​14383)

Scheduler (Experimental)

• Post to MessageChannel instead of window. (@​acdlite in #​14234)
• Reduce serialization overhead. (@​developit in #​14249)
• Fix fallback to setTimeout in testing environments. (@​bvaughn in #​14358)
• Add methods for debugging. (@​mrkev in #​14053)

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