chore(deps): update dependency webpack-cli to v6

Author: renovate[bot]

package.json

@@ -57,7 +57,7 @@
     "semantic-release": "19.0.5",
     "tap": "12.7.0",
     "webpack": "4.47.0",
-    "webpack-cli": "3.3.12",
+    "webpack-cli": "6.0.0",
     "webpack-dev-server": "3.11.3"
   },
   "config": {