[Snyk] Security upgrade socket.io from 1.7.4 to 2.4.0

[snyk-bot]

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:
  • result/package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	658/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 5.3	Insecure Defaults SNYK-JS-SOCKETIO-1024859	Yes	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: socket.io

The new version differs by 102 commits.

• 873fdc5 chore(release): 2.4.0
• f78a575 fix(security): do not allow all origins by default
• d33a619 fix: properly overwrite the query sent in the handshake
• 3951a79 chore: bump engine.io version
• 6fa026f ci: migrate to GitHub Actions
• 47161a6 [chore] Release 2.3.0
• cf39362 [chore] Bump socket.io-parser to version 3.4.0
• 4d01b2c test: remove deprecated Buffer usage (#3481)
• 8227192 [docs] Fix the default value of the 'origins' parameter (#3464)
• 1150eb5 [chore] Bump engine.io to version 3.4.0
• 9c1e73c [chore] Update the license of the chat example (#3410)
• df05b73 [chore] Release 2.2.0
• b00ae50 [feat] Add cache-control header when serving the client source (#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 (#3355)
• 190d22b [chore] Bump dependencies
• 7b8fba7 [test] Update Travis configuration
• e5f0cea [docs] Use new JavaScript syntax inside the README (#3360)
• 7e35f90 [docs] fix `this` scope in the chat example
• 2dbec77 [chore] Update issue template
• d97d873 [docs] update README.md (#3309)
• e0b2cb0 [chore] Release 2.1.1
• 1decae3 [feat] Add local flag to the socket object (#3219)
• 0279c47 [docs] Convert the chat example to ES6 (#3227)

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