[Snyk] Security upgrade socket.io from 2.3.0 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:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	551/1000 Why? Recently disclosed, Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-JS-WS-1296835	No	No Known Exploit

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

Commit messages

Package name: socket.io

The new version differs by 5 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

See the full diff

Check the changes in this PR to ensure they won't cause issues with your project.

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[coveralls]

Coverage increased (+0.7%) to 98.124% when pulling 0944644 on snyk-fix-56efe0d1ad075366dccff7ed6e2b7853 into 6089d22 on master.