Bump ws from 7.2.3 to 7.3.0 in /tests (#37)

Bumps [ws](https://github.com/websockets/ws) from 7.2.3 to 7.3.0.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@7.2.3...7.3.0)

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