[Snyk] Security upgrade webpack-dev-server from 3.9.0 to 4.0.0#78

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snyk-bot wants to merge 1 commit intodevelopfrom snyk-fix-40665a0b2374be98d1cc268ba57010d5

+1-1

Commits on Sep 12, 2021

fix: cvat-ui/package.json to reduce vulnerabilities
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