Update dependency socket.io to 2.4.0 [SECURITY]

[renovate[bot]]

This PR contains the following updates:

Package	Change
socket.io	2.3.0 -> 2.4.0

GitHub Vulnerability Alerts

CVE-2020-28481

The package socket.io before 2.4.0 are vulnerable to Insecure Defaults due to CORS Misconfiguration. All domains are whitelisted by default.

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