[Snyk] Security upgrade react-scripts from 3.4.1 to 4.0.0#15

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-6b2f37c769128650b7f5e6ce80dbe314

+12,143-9,127

Commits on Oct 24, 2020

fix: package.json & package-lock.json to reduce vulnerabilities
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