Bump mermaid from 10.9.3 to 10.9.4 in /nav-app (#694)

Bumps [mermaid](https://github.com/mermaid-js/mermaid) from 10.9.3 to 10.9.4.
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Commits](mermaid-js/mermaid@v10.9.3...v10.9.4)

---
updated-dependencies:
- dependency-name: mermaid
  dependency-version: 10.9.4
  dependency-type: indirect
...

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Author: dependabot[bot]