chore: bump mermaid from 11.13.0 to 11.15.0 in /client

Bumps [mermaid](https://github.com/mermaid-js/mermaid) from 11.13.0 to 11.15.0.
- [Release notes](https://github.com/mermaid-js/mermaid/releases)
- [Commits](https://github.com/mermaid-js/mermaid/compare/mermaid@11.13.0...mermaid@11.15.0)

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

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

Author: dependabot[bot]

client/package-lock.json

@@ -77,7 +77,7 @@
     "katex": "^0.16.28",
     "lodash-es": "^4.18.1",
     "luxon": "^3.3.0",
-    "mermaid": "^11.12.2",
+    "mermaid": "^11.15.0",
     "morgan": "^1.10.1",
     "prom-client": "^15.1.3",
     "query-string": "^6.14.1",