chore(deps): bump socket.io from 2.1.1 to 2.4.1

Bumps [socket.io](https://github.com/socketio/socket.io) from 2.1.1 to 2.4.1.
- [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@2.1.1...2.4.1)

Signed-off-by: dependabot[bot] <support@github.com>