Bump webpack-cli from 3.3.12 to 4.5.0

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.3.12 to 4.5.0.
- [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@4.5.0)

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

package.json

@@ -59,7 +59,7 @@
     "react-dom": "^16.13.0",
     "sass-loader": "^8.0.2",
     "webpack": "^4.42.0",
-    "webpack-cli": "^3.3.11"
+    "webpack-cli": "^4.5.0"
   },
   "dependencies": {
     "prop-types": "^15.7.2"