Bump mermaid from 10.9.3 to 10.9.4 in /frontend

Bumps [mermaid](https://github.com/mermaid-js/mermaid) from 10.9.3 to 10.9.4.
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Commits](mermaid-js/mermaid@v10.9.3...v10.9.4)

---
updated-dependencies:
- dependency-name: mermaid
  dependency-version: 10.9.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -39,7 +39,7 @@
     "hljs": "^6.2.3",
     "marked": "^4.1.0",
     "material-symbols": "^0.2.11",
-    "mermaid": "^11.6.0",
+    "mermaid": "^10.9.4",
     "moment": "^2.29.4",
     "ng-recaptcha": "^10.0.0",
     "ngx-color-picker": "^13.0.0",