Bump workbox-webpack-plugin from 7.3.0 to 7.4.0 in /webapp

Bumps [workbox-webpack-plugin](https://github.com/googlechrome/workbox) from 7.3.0 to 7.4.0.
- [Release notes](https://github.com/googlechrome/workbox/releases)
- [Commits](GoogleChrome/workbox@v7.3.0...v7.4.0)

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

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

Author: dependabot[bot]

webapp/package.json

@@ -57,7 +57,7 @@
     "webpack": "^5.103.0",
     "webpack-dev-server": "^5.2.2",
     "webpack-manifest-plugin": "^6.0.1",
-    "workbox-webpack-plugin": "^7.3.0"
+    "workbox-webpack-plugin": "^7.4.0"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3.3.1",