fix(deps): update react monorepo to v16.8.0-alpha.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
react	dependencies	minor	16.7.0-alpha.2 -> 16.8.0-alpha.0	homepage, source
react-dom	dependencies	minor	16.7.0-alpha.2 -> 16.8.0-alpha.0	homepage, source

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