📌 Bump mermaid from 11.7.0 to 11.8.1

Bumps [mermaid](https://github.com/mermaid-js/mermaid) from 11.7.0 to 11.8.1.
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Changelog](https://github.com/mermaid-js/mermaid/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/mermaid-js/mermaid/compare/mermaid@11.7.0...mermaid@11.8.1)

---
updated-dependencies:
- dependency-name: mermaid
  dependency-version: 11.8.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -35,7 +35,7 @@
     "fuse.js": "^7.1.0",
     "jsdom": "^26.1.0",
     "katex": "^0.16.22",
-    "mermaid": "^11.7.0",
+    "mermaid": "^11.8.1",
     "prettier": "^3.6.2",
     "prettier-plugin-go-template": "^0.0.15",
     "prettier-plugin-tailwindcss": "^0.6.13",