chore(deps): bump rollup-plugin-postcss from 3.1.8 to 4.0.0

Bumps [rollup-plugin-postcss](https://github.com/egoist/rollup-plugin-postcss) from 3.1.8 to 4.0.0.
- [Release notes](https://github.com/egoist/rollup-plugin-postcss/releases)
- [Changelog](https://github.com/egoist/rollup-plugin-postcss/blob/master/CHANGELOG-OLD.md)
- [Commits](https://github.com/egoist/rollup-plugin-postcss/compare/v3.1.8...v4.0.0)

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

packages/cli/package.json

@@ -96,7 +96,7 @@
     "rollup-plugin-dts": "^2.0.1",
     "rollup-plugin-esbuild": "2.6.x",
     "rollup-plugin-peer-deps-external": "^2.2.2",
-    "rollup-plugin-postcss": "^3.1.1",
+    "rollup-plugin-postcss": "^4.0.0",
     "rollup-pluginutils": "^2.8.2",
     "semver": "^7.3.2",
     "start-server-webpack-plugin": "^2.2.5",