Bump webpack-cli from 3.3.12 to 4.2.0 (#15123)

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.3.12 to 4.2.0.
- [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/v3.3.12...webpack-cli@4.2.0

)

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package.json

@@ -165,7 +165,7 @@
     "webpack": "^4.44.2",
     "webpack-assets-manifest": "^3.1.1",
     "webpack-bundle-analyzer": "^4.1.0",
-    "webpack-cli": "^3.3.12",
+    "webpack-cli": "^4.2.0",
     "webpack-merge": "^5.4.0",
     "wicg-inert": "^3.1.0"
   },