[Snyk] Security upgrade socket.io from 2.4.1 to 3.0.0#8

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-525a55b4f5faeb9359003f3b97560ab1

+1-1

Commits on May 5, 2021

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