Bump webpack-cli from 3.3.12 to 4.1.0

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.3.12 to 4.1.0.
- [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@4.1.0)

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

package.json

@@ -62,7 +62,7 @@
     "typescript": "4.0",
     "utf8": "^3.0.0",
     "webpack": "^4.44.2",
-    "webpack-cli": "^3.3.12",
+    "webpack-cli": "^4.1.0",
     "ws": "^7.3.1",
     "xterm-benchmark": "^0.1.3"
   }