[Snyk] Security upgrade react-scripts from 3.2.0 to 4.0.0#17

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snyk-bot wants to merge 1 commit intonextfrom snyk-fix-710083e8e887b8c8b1ec3f6d60b62e79

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Commits on Dec 17, 2020

fix: examples/cra-ts-kitchen-sink/package.json to reduce vulnerabilities
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