Bump socket.io from 2.4.1 to 2.5.1

Bumps [socket.io](https://github.com/socketio/socket.io) from 2.4.1 to 2.5.1.
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/2.5.1/CHANGELOG.md)
- [Commits](socketio/socket.io@2.4.1...2.5.1)

---
updated-dependencies:
- dependency-name: socket.io
  dependency-type: indirect
...

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