[Snyk] Security upgrade socket.io from 2.0.4 to 2.2.0

[otti0815]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • plugin/multiplex/package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Arbitrary Code Injection SNYK-JS-XMLHTTPREQUESTSSL-1082936	No	Proof of Concept
	Access Restriction Bypass SNYK-JS-XMLHTTPREQUESTSSL-1255647	No	Proof of Concept

Commit messages

Package name: socket.io

The new version differs by 28 commits.

• df05b73 [chore] Release 2.2.0
• b00ae50 [feat] Add cache-control header when serving the client source (tiltle have been added or slider name hakimel/reveal.js#2907)
• d3c653d [docs] Add Touch Support to the whiteboard example (#3104)
• a7fbd1a [fix] Throw an error when trying to access the clients of a dynamic namespace (The project is great. Is there a flutter version? Flutter is an open source mobile application software development kit developed by Google for developing applications for Android, iOS, Web, Windows, macOS, Linux Desktop, Google Fuchsia. Flutter is making efforts to games, Metaverse, and web3.  https://github.com/flutter/flutter 项目非常棒 有flutter版本吗？Flutter是一个由谷歌开发的开源移动应用软件开发工具包，用于为Android、iOS、Web、We'bWindows、macOS、Linux Desktop、Google Fuchsia开发应用。 Flutter正在向游戏、元宇宙、web3发力。 hakimel/reveal.js#3355)
• 190d22b [chore] Bump dependencies
• 7b8fba7 [test] Update Travis configuration
• e5f0cea [docs] Use new JavaScript syntax inside the README (Background images containing single quote in url not showing hakimel/reveal.js#3360)
• 7e35f90 [docs] fix `this` scope in the chat example
• 2dbec77 [chore] Update issue template
• d97d873 [docs] update README.md (Customized Slides Overviewpage hakimel/reveal.js#3309)
• e0b2cb0 [chore] Release 2.1.1
• 1decae3 [feat] Add local flag to the socket object (Nested fragment not working hakimel/reveal.js#3219)
• 0279c47 [docs] Convert the chat example to ES6 (Add Code Titles hakimel/reveal.js#3227)
• 2917942 [docs] Clarify private messaging in the emit cheatsheet (No content visible without javascript hakimel/reveal.js#3232)
• db831a3 [chore] Release 2.1.0
• ac945d1 [feat] Add support for dynamic namespaces (Equations cannot be rendered correctly in notes hakimel/reveal.js#3195)
• ad0c052 [docs] Add note in docs for `origins(fn)` about `error` needing to be a string. (Rhmkjgv hakimel/reveal.js#2895)
• 1f1d64b [fix] Include the protocol in the origins check (Slide number in ?print-pdf of deck with vertical slides is wrong hakimel/reveal.js#3198)
• f4fc517 [fix] Properly emit 'connect' when using a custom namespace (Get the slide number from iframe hakimel/reveal.js#3197)
• be61ba0 [docs] Add link to a Dart client implementation (Fix: multiple image-urls in data-background-image hakimel/reveal.js#2940)
• c0c79f0 [feat] Add support for dynamic namespaces (math.js: Uncaught TypeError: Hc is not a function hakimel/reveal.js#3187)
• dea5214 [chore] Bump superagent and supertest versions (Add diagrams hakimel/reveal.js#3186)
• b1941d5 [chore] Bump engine.io to version 3.2.0
• a23007a [docs] Update license year (Advancing into slide fragment render removes clickability from floated image hakimel/reveal.js#3153)

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