Bump css-minimizer-webpack-plugin from 6.0.0 to 8.0.0 in /assets

Bumps [css-minimizer-webpack-plugin](https://github.com/webpack/css-minimizer-webpack-plugin) from 6.0.0 to 8.0.0.
- [Release notes](https://github.com/webpack/css-minimizer-webpack-plugin/releases)
- [Changelog](https://github.com/webpack/css-minimizer-webpack-plugin/blob/main/CHANGELOG.md)
- [Commits](webpack/css-minimizer-webpack-plugin@v6.0.0...v8.0.0)

---
updated-dependencies:
- dependency-name: css-minimizer-webpack-plugin
  dependency-version: 8.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

assets/package.json

@@ -16,7 +16,7 @@
     "babel-loader": "^9.1.3",
     "copy-webpack-plugin": "^12.0.2",
     "css-loader": "^7.1.1",
-    "css-minimizer-webpack-plugin": "^6.0.0",
+    "css-minimizer-webpack-plugin": "^8.0.0",
     "mini-css-extract-plugin": "^2.8.1",
     "webpack-cli": "^5.1.4",
     "webpack": "5.105.4"