chore(deps-dev): bump rollup-plugin-postcss from 4.0.1 to 4.0.2

Bumps [rollup-plugin-postcss](https://github.com/egoist/rollup-plugin-postcss) from 4.0.1 to 4.0.2.
- [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/v4.0.1...v4.0.2)

---
updated-dependencies:
- dependency-name: rollup-plugin-postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -68,7 +68,7 @@
     "rollup": "^2.60.1",
     "rollup-plugin-bundle-size": "^1.0.3",
     "rollup-plugin-livereload": "^2.0.5",
-    "rollup-plugin-postcss": "^4.0.1",
+    "rollup-plugin-postcss": "^4.0.2",
     "rollup-plugin-serve": "^1.1.0",
     "rollup-plugin-typescript2": "^0.31.0",
     "start-server-and-test": "^1.14.0",