chore(deps)(deps): bump mermaid from 11.14.0 to 11.15.0 in /apps/docs

Bumps [mermaid](https://github.com/mermaid-js/mermaid) from 11.14.0 to 11.15.0.
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Commits](https://github.com/mermaid-js/mermaid/compare/mermaid@11.14.0...mermaid@11.15.0)

---
updated-dependencies:
- dependency-name: mermaid
  dependency-version: 11.15.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

apps/docs/bun.lock

@@ -32,7 +32,7 @@
     "astro": "^5.16.0",
     "astro-mermaid": "^2.0.1",
     "clsx": "^2.1.1",
-    "mermaid": "11.14.0",
+    "mermaid": "11.15.0",
     "react": "^19.2.6",
     "react-dom": "^19.2.6",
     "reading-time": "^1.5.0",