[Snyk] Security upgrade socket.io from 2.4.1 to 3.0.0#7

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-a3ad0b5169cd8311e2a8439e46dfd8b8

+1-1

Commits on Apr 27, 2021

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