Bump ws and @wp-playground/cli

Bumps [ws](https://github.com/websockets/ws) and [@wp-playground/cli](https://github.com/WordPress/wordpress-playground). These dependencies needed to be updated together.

Updates `ws` from 8.18.3 to 8.21.0
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.18.3...8.21.0)

Updates `@wp-playground/cli` from 3.1.15 to 3.1.41
- [Release notes](https://github.com/WordPress/wordpress-playground/releases)
- [Changelog](https://github.com/WordPress/wordpress-playground/blob/trunk/CHANGELOG.md)
- [Commits](WordPress/wordpress-playground@v3.1.15...v3.1.41)

---
updated-dependencies:
- dependency-name: ws
  dependency-version: 8.21.0
  dependency-type: indirect
- dependency-name: "@wp-playground/cli"
  dependency-version: 3.1.41
  dependency-type: indirect
...

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Author: dependabot[bot]