Bump ws in /functional-samples/tutorial.terminate-sw/selenium (#1705)

Bumps [ws](https://github.com/websockets/ws) from 8.17.1 to 8.21.1.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.17.1...8.21.1)

---
updated-dependencies:
- dependency-name: ws
  dependency-version: 8.21.0
  dependency-type: indirect
...

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