Bump workbox-webpack-plugin in /frontend/packages/build

Bumps [workbox-webpack-plugin](https://github.com/googlechrome/workbox) from 6.6.1 to 7.3.0.
- [Release notes](https://github.com/googlechrome/workbox/releases)
- [Commits](https://github.com/googlechrome/workbox/commits/v7.3.0)

---
updated-dependencies:
- dependency-name: workbox-webpack-plugin
  dependency-version: 7.3.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

frontend/packages/build/package.json

@@ -22,6 +22,6 @@
     "svg-inline-loader": "^0.8.2",
     "webpack-bundle-analyzer": "^4",
     "webpack-merge": "^5.3.0",
-    "workbox-webpack-plugin": "^6.0.0"
+    "workbox-webpack-plugin": "^7.3.0"
   }
 }