[Snyk] Security upgrade socket.io from 1.3.7 to 2.4.0#9

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snyk-bot wants to merge 1 commit intomasterfrom snyk-fix-a6a4cae5bdc3cd82e5c51c12fed59bd2

+1-1

Commits on May 27, 2021

fix: plugin/multiplex/package.json to reduce vulnerabilities
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