Bump workbox-routing from 7.1.0 to 7.4.0 in /frontend

Bumps [workbox-routing](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-routing
  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

@@ -35,7 +35,7 @@
     "workbox-navigation-preload": "^7.1.0",
     "workbox-precaching": "^7.1.0",
     "workbox-range-requests": "^7.1.0",
-    "workbox-routing": "^7.1.0",
+    "workbox-routing": "^7.4.0",
     "workbox-strategies": "^7.1.0",
     "workbox-streams": "^7.1.0"
   },