chore(deps-dev): bump webpack-cli in /build/frontend-legacy

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 6.0.1 to 7.1.0.
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/main/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-cli/compare/webpack-cli@6.0.1...webpack-cli@7.1.0)

---
updated-dependencies:
- dependency-name: webpack-cli
  dependency-version: 7.0.3
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

build/frontend-legacy/package-lock.json

@@ -131,7 +131,7 @@
     "vue-loader": "^15.11.1",
     "vue-template-compiler": "^2.7.16",
     "webpack": "^5.106.2",
-    "webpack-cli": "^6.0.1",
+    "webpack-cli": "^7.1.0",
     "webpack-merge": "^6.0.1",
     "workbox-webpack-plugin": "^7.4.1"
   },