chore: bump css-minimizer-webpack-plugin from 4.0.0 to 6.0.0

Bumps [css-minimizer-webpack-plugin](https://github.com/webpack-contrib/css-minimizer-webpack-plugin) from 4.0.0 to 6.0.0.
- [Release notes](https://github.com/webpack-contrib/css-minimizer-webpack-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/css-minimizer-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/css-minimizer-webpack-plugin@v4.0.0...v6.0.0)

---
updated-dependencies:
- dependency-name: css-minimizer-webpack-plugin
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -60,7 +60,7 @@
     "concurrently": "7.6.0",
     "conventional-changelog-cli": "2.2.2",
     "css-loader": "6.7.1",
-    "css-minimizer-webpack-plugin": "4.0.0",
+    "css-minimizer-webpack-plugin": "6.0.0",
     "darkreader": "4.9.51",
     "dayjs": "1.11.5",
     "dotenv": "16.0.3",