Bump webpack-cli from 3.3.12 to 4.10.0 in /variant-switcher

Bumps [webpack-cli](https://github.com/webpack/webpack-cli) from 3.3.12 to 4.10.0.
- [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@4.10.0)

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

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

variant-switcher/package.json

@@ -24,7 +24,7 @@
         "ts-loader": "^6.0.4",
         "url-loader": "^4.1.1",
         "webpack": "^4.46.0",
-        "webpack-cli": "^3.3.6"
+        "webpack-cli": "^4.10.0"
     },
     "devDependencies": {
         "@brightlayer-ui/prettier-config": "^1.0.3",