Bumps [socket.io](https://github.com/socketio/socket.io) from 3.1.2 to 4.0.0. - [Release notes](https://github.com/socketio/socket.io/releases) - [Changelog](https://github.com/socketio/socket.io/blob/master/CHANGELOG.md) - [Commits](https://github.com/socketio/socket.io/compare/3.1.2...4.0.0) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>