Update dependency webpack-cli to v6 (#671)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -46,7 +46,7 @@
     "userscript-metadata-webpack-plugin": "^0.4.0",
     "webpack": "^5.96.1",
     "webpack-bundle-analyzer": "^4.10.2",
-    "webpack-cli": "^5.1.4",
+    "webpack-cli": "^6.0.1",
     "webpack-livereload-plugin": "^3.0.2",
     "webpack-merge": "^6.0.1",
     "webpack-sources": "^3.2.3"