build(deps): bump mermaid

Bumps the npm_and_yarn group with 1 update in the /website directory: [mermaid](https://github.com/mermaid-js/mermaid).


Updates `mermaid` from 11.13.0 to 11.15.0
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Commits](https://github.com/mermaid-js/mermaid/compare/mermaid@11.13.0...mermaid@11.15.0)

---
updated-dependencies:
- dependency-name: mermaid
  dependency-version: 11.15.0
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

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Author: dependabot[bot]