chore(deps): bump ws from 8.18.0 to 8.20.1 in /sample/16-gateways-ws

Bumps [ws](https://github.com/websockets/ws) from 8.18.0 to 8.20.1.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](https://github.com/websockets/ws/compare/8.18.0...8.20.1)

---
updated-dependencies:
- dependency-name: ws
  dependency-version: 8.20.1
  dependency-type: direct:production
...

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