Bump ws from 8.18.0 to 8.21.0 (#72)

Bumps the npm_and_yarn group with 1 update in the / directory: [ws](https://github.com/websockets/ws).


Updates `ws` from 8.18.0 to 8.21.0
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.18.0...8.21.0)

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

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