Bump ws from 7.4.3 to 7.4.6 in /tests (#390)

Bumps [ws](https://github.com/websockets/ws) from 7.4.3 to 7.4.6.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@7.4.3...7.4.6)

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