[Snyk] Security upgrade webpack-dev-server from 3.11.2 to 4.0.0#31

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-23eea04fbf78b7c80937e53583aae85c

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Commits on Sep 13, 2021

fix: examples/browser-webpack/package.json to reduce vulnerabilities
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