[Snyk] Security upgrade socket.io from 2.2.0 to 2.4.0#71

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-592dd18f5cdbd12b760ecf2b5460df46

+97-112

Commits on Jan 8, 2021

fix: packages/web-component-tester/package.json & packages/web-component-tester/package-lock.json to reduce vulnerabilities
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