Bump socket.io-parser from 4.2.1 to 4.2.3 in /packages/demo (#1737)

Bumps [socket.io-parser](https://github.com/socketio/socket.io-parser) from 4.2.1 to 4.2.3.
- [Release notes](https://github.com/socketio/socket.io-parser/releases)
- [Changelog](https://github.com/socketio/socket.io-parser/blob/main/CHANGELOG.md)
- [Commits](socketio/socket.io-parser@4.2.1...4.2.3)

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

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