[Snyk] Security upgrade webpack-dev-server from 3.11.2 to 4.0.0#73

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-6befb09e60d02bc98d9f5bd6ac211aa4

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Commits on Aug 18, 2021

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