chore(deps-dev): bump mermaid from 11.12.2 to 11.15.0

Bumps [mermaid](https://github.com/mermaid-js/mermaid) from 11.12.2 to 11.15.0.
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Commits](https://github.com/mermaid-js/mermaid/compare/mermaid@11.12.2...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]

package.json

@@ -20,7 +20,7 @@
   "devDependencies": {
     "@tailwindcss/postcss": "^4.1.18",
     "autoprefixer": "^10.4.23",
-    "mermaid": "^11.12.2",
+    "mermaid": "^11.15.0",
     "postcss": "^8.5.6",
     "prettier": "^3.8.1",
     "tailwindcss": "^4.1.18",