Bump socket.io from 2.3.0 to 2.4.1 in /examples/blockly-angular (goog…

…le#541)

Bumps [socket.io](https://github.com/socketio/socket.io) from 2.3.0 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@2.3.0...2.4.1)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>