[Security] Bump socket.io from 2.3.0 to 2.4.1 in /build

Bumps [socket.io](https://github.com/socketio/socket.io) from 2.3.0 to 2.4.1. **This update includes a security fix.**
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/2.4.1/CHANGELOG.md)
- [Commits](socketio/socket.io@2.3.0...2.4.1)

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