Bump ws from 7.3.0 to 7.5.10 in /exercises/practice/flower-field (#349)

Bumps [ws](https://github.com/websockets/ws) from 7.3.0 to 7.5.10.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@7.3.0...7.5.10)

---
updated-dependencies:
- dependency-name: ws
  dependency-version: 7.5.10
  dependency-type: indirect
...

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