[Snyk] Security upgrade webpack-cli from 2.1.5 to 3.0.0#11

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-a82ac7852dde9e4a832c09a94c4ea5d9

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Commits on May 26, 2021

fix: demo/webpack/package.json to reduce vulnerabilities
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