[Snyk] Security upgrade webpack-dev-server from 3.1.14 to 4.0.0#61

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-c761fec874d4b2fd0d3a5cef97d821a6

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Commits on Aug 19, 2021

fix: examples/preact/package.json to reduce vulnerabilities
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