Update react monorepo to v16.9.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
react (source)	dependencies	minor	16.8.6 -> 16.9.0
react-dom (source)	dependencies	minor	16.8.6 -> 16.9.0

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Release Notes

facebook/react

### [`v16.9.0`](https://togithub.com/facebook/react/blob/master/CHANGELOG.md#​1690-August-8-2019) [Compare Source](https://togithub.com/facebook/react/compare/v16.8.6...v16.9.0) ##### React - Add `` API for gathering performance measurements programmatically. ([@​bvaughn](https://togithub.com/bvaughn) in [#​15172](https://togithub.com/facebook/react/pull/15172)) - Remove `unstable_ConcurrentMode` in favor of `unstable_createRoot`. ([@​acdlite](https://togithub.com/acdlite) in [#​15532](https://togithub.com/facebook/react/pull/15532)) ##### React DOM - Deprecate old names for the `UNSAFE_*` lifecycle methods. ([@​bvaughn](https://togithub.com/bvaughn) in [#​15186](https://togithub.com/facebook/react/pull/15186) and [@​threepointone](https://togithub.com/threepointone) in [#​16103](https://togithub.com/facebook/react/pull/16103)) - Deprecate `javascript:` URLs as a common attack surface. ([@​sebmarkbage](https://togithub.com/sebmarkbage) in [#​15047](https://togithub.com/facebook/react/pull/15047)) - Deprecate uncommon "module pattern" (factory) components. ([@​sebmarkbage](https://togithub.com/sebmarkbage) in [#​15145](https://togithub.com/facebook/react/pull/15145)) - Add support for the `disablePictureInPicture` attribute on `

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