Bump ws in /code-samples/eventing/bookstore-sample-app/solution/frontend (#6649)

Bumps [ws](https://github.com/websockets/ws) from 8.18.3 to 8.21.0.
- [Release notes](https://github.com/websockets/ws/releases)
- [Commits](websockets/ws@8.18.3...8.21.0)

---
updated-dependencies:
- dependency-name: ws
  dependency-version: 8.21.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

code-samples/eventing/bookstore-sample-app/solution/frontend/package-lock.json

@@ -18,7 +18,7 @@
     "next-ws": "^2.1.4",
     "react": "^18",
     "react-dom": "^18",
-    "ws": "^8.18.3"
+    "ws": "^8.21.0"
   },
   "devDependencies": {
     "@types/node": "^20",