[Snyk] Security upgrade webpack-dev-server from 3.11.2 to 4.0.0#22

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-2a7a5223ecb354e3564a6108c2b1baa1

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Commits on Aug 18, 2021

fix: packages/docusaurus/package.json to reduce vulnerabilities
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