[Snyk] Security upgrade webpack-dev-server from 2.11.0 to 3.11.0#42

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snyk-bot wants to merge 1 commit intonextfrom snyk-fix-4efb7b8a467f3e3324d3862a834a2020

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Commits on Jul 9, 2020

fix: packages/react-scripts/package.json to reduce vulnerabilities
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