build(deps-dev): bump mermaid from 11.14.0 to 11.15.0 in /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:development
...

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

Author: dependabot[bot]

docs/package-lock.json

@@ -11,7 +11,7 @@
     "check-links": "node scripts/check-broken-links.mjs ."
   },
   "devDependencies": {
-    "mermaid": "^11.0.0",
+    "mermaid": "^11.15.0",
     "rehype-slug": "^6.0.0",
     "rehype-stringify": "^10.0.0",
     "remark-gfm": "^4.0.0",