Allow webpack-cli 6.x

Close shakacode#532

Author: tagliala

CHANGELOG.md

@@ -10,6 +10,10 @@ _next_ branch is for v8 changes
 ## [Unreleased]
 Changes since the last non-beta release.
 
+### Added
+
+- Allow `webpack-cli` v6. [PR 533](https://github.com/shakacode/shakapacker/pull/533) by [tagliala](https://github.com/tagliala).
+
 ### Changed
 - Changed internal `require`s to `require_relative` to make code less dependent on the load path. [PR 516](https://github.com/shakacode/shakapacker/pull/516) by [tagliala](https://github.com/tagliala).
 - Allow configuring webpack from a Typescript file (`config/webpack/webpack.config.ts`). [PR 524](https://github.com/shakacode/shakapacker/pull/524) by [jdelStrother](https://github.com/jdelStrother).

package.json

@@ -60,7 +60,7 @@
     "terser-webpack-plugin": "^5.3.1",
     "webpack": "^5.72.0",
     "webpack-assets-manifest": "^5.0.6",
-    "webpack-cli": "^4.9.2 || ^5.0.0",
+    "webpack-cli": "^4.9.2 || ^5.0.0 || ^6.0.0",
     "webpack-dev-server": "^4.9.0 || ^5.0.0",
     "webpack-merge": "^5.8.0 || ^6.0.0"
   },