[Snyk] Security upgrade socket.io from 2.4.1 to 2.5.0

[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:
  • backend/package.json
  • backend/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	661/1000 Why? Recently disclosed, Has a fix available, CVSS 7.5	Denial of Service (DoS) SNYK-JS-ENGINEIO-3136336	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 6 commits.

• baa6804 chore(release): 2.5.0
• f223178 fix: prevent the socket from joining a room after disconnection
• 226cc16 fix: only set 'connected' to true after middleware execution
• 05e1278 fix: fix race condition in dynamic namespaces
• 22d4bdf fix: ignore packet received after disconnection
• dfded53 chore: update engine.io version to 3.6.0

See the full diff

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

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