Upgrade React to 16.3.2

[jkimbo]

Summary

To support the new forwardRef and Context api's in pretty-format the version of React that is used in tests needs to be updated.

Test plan

Ensure tests pass.

[codecov-io]

Codecov Report

Merging #6092 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #6092   +/-   ##
======================================
  Coverage    64.1%   64.1%           
======================================
  Files         217     217           
  Lines        8335    8335           
  Branches        4       4           
======================================
  Hits         5343    5343           
  Misses       2991    2991           
  Partials        1       1

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[thymikee]

FYI we plan to clean up how our internal deps are resolved by Yarn and your change is included in this PR: #6090. If it gets merged, this one becomes obsolete (I'll mark it so GitHub can do it automatically).

[jkimbo]

That's great thanks. I raised this PR only because I needed to upgrade react for this: #6093

[github-actions]

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