Bump workbox-broadcast-update from 7.1.0 to 7.4.0 in /frontend

Bumps [workbox-broadcast-update](https://github.com/googlechrome/workbox) from 7.1.0 to 7.4.0.
- [Release notes](https://github.com/googlechrome/workbox/releases)
- [Commits](https://github.com/googlechrome/workbox/compare/v7.1.0...v7.4.0)

---
updated-dependencies:
- dependency-name: workbox-broadcast-update
  dependency-version: 7.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -27,7 +27,7 @@
     "react-router-dom": "^6.17.0",
     "typescript": "^5.2.2",
     "workbox-background-sync": "^7.1.0",
-    "workbox-broadcast-update": "^7.1.0",
+    "workbox-broadcast-update": "^7.4.0",
     "workbox-cacheable-response": "^7.1.0",
     "workbox-core": "^7.1.0",
     "workbox-expiration": "^7.1.0",