Bump webpack-cli from 5.1.4 to 6.0.1 in /mpcontribs-portal

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 5.1.4 to 6.0.1.
- [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/webpack-cli@5.1.4...webpack-cli@6.0.1)

---
updated-dependencies:
- dependency-name: webpack-cli
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

mpcontribs-portal/package.json

@@ -49,7 +49,7 @@
     "underscore": "^1.13.6",
     "webpack": "^5.89.0",
     "webpack-bundle-analyzer": "^4.9.1",
-    "webpack-cli": "^5.1.4",
+    "webpack-cli": "^6.0.1",
     "webpack4-bundle-tracker": "^0.4.3-beta"
   }
 }