[Snyk] Security upgrade react-scripts from 3.4.1 to 3.4.2#21

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-cbae66296f15fa3517befeb13a106c8d

+919-1,223

Commits on Aug 12, 2020

fix: react-app/package.json & react-app/package-lock.json to reduce vulnerabilities
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