Bump webpack-cli from 5.1.4 to 6.0.1 in /ui/react-app

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 5.1.4 to 6.0.1.
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-cli/compare/[email protected]@6.0.1)

---
updated-dependencies:
- dependency-name: webpack-cli
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

ui/react-app/package-lock.json

@@ -44,7 +44,7 @@
     "typescript": "^5.7.2",
     "webpack": "^5.95.0",
     "webpack-bundle-analyzer": "^4.10.2",
-    "webpack-cli": "^5.1.4",
+    "webpack-cli": "^6.0.1",
     "webpack-dev-server": "^5.2.0",
     "webpack-merge": "^6.0.1"
   }