Bump css-minimizer-webpack-plugin from 5.0.1 to 6.0.0

Bumps [css-minimizer-webpack-plugin](https://github.com/webpack-contrib/css-minimizer-webpack-plugin) from 5.0.1 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](https://github.com/webpack-contrib/css-minimizer-webpack-plugin/compare/v5.0.1...v6.0.0)

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

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

package.json

@@ -21,7 +21,7 @@
     "component-emitter": "^2.0.0",
     "compression-webpack-plugin": "^11.0.0",
     "css-loader": "^6.9.1",
-    "css-minimizer-webpack-plugin": "^5.0.1",
+    "css-minimizer-webpack-plugin": "^6.0.0",
     "d3": "^7.8.5",
     "d3-tip": "^0.9.1",
     "highlight.js": "^11.9.0",