build(deps-dev): bump webpack-cli from 3.3.12 to 4.0.0 in /frontend (#630)

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.3.12 to 4.0.0.
- [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])

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

frontend/package.json

@@ -46,7 +46,7 @@
     "standard": "^14.1.0",
     "terser-webpack-plugin": "^4.1.0",
     "webpack": "^4.40.2",
-    "webpack-cli": "^3.3.6",
+    "webpack-cli": "^4.0.0",
     "webpack-dev-server": "^3.7.2",
     "webpack-merge": "^4.2.1"
   },