Bump ws and @mermaid-js/mermaid-cli in /diagrams (#504)

Bumps [ws](https://github.com/websockets/ws) to 8.18.0 and updates ancestor dependency [@mermaid-js/mermaid-cli](https://github.com/mermaid-js/mermaid-cli). These dependencies need to be updated together.


Updates `ws` from 8.13.0 to 8.18.0
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.13.0...8.18.0)

Updates `@mermaid-js/mermaid-cli` from 10.9.1 to 11.2.0
- [Release notes](https://github.com/mermaid-js/mermaid-cli/releases)
- [Commits](mermaid-js/mermaid-cli@10.9.1...11.2.0)

---
updated-dependencies:
- dependency-name: ws
  dependency-type: indirect
- dependency-name: "@mermaid-js/mermaid-cli"
  dependency-type: direct:production
...

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