Bump css-minimizer-webpack-plugin from 7.0.4 to 8.0.0 in /ui

Bumps [css-minimizer-webpack-plugin](https://github.com/webpack/css-minimizer-webpack-plugin) from 7.0.4 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@v7.0.4...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]

ui/package-lock.json

@@ -32,7 +32,7 @@
     "buffer": "^6.0.3",
     "copy-webpack-plugin": "^14.0.0",
     "css-loader": "^7.1.4",
-    "css-minimizer-webpack-plugin": "^7.0.4",
+    "css-minimizer-webpack-plugin": "^8.0.0",
     "dotenv-webpack": "^8.1.1",
     "enzyme": "^3.11.0",
     "enzyme-to-json": "^3.6.2",