chore(deps-dev): bump postcss-loader from 7.3.4 to 8.0.0

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 7.3.4 to 8.0.0.
- [Release notes](https://github.com/webpack-contrib/postcss-loader/releases)
- [Changelog](https://github.com/webpack-contrib/postcss-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/postcss-loader@v7.3.4...v8.0.0)

---
updated-dependencies:
- dependency-name: postcss-loader
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -153,7 +153,7 @@
     "open-cli": "^8.0.0",
     "path-browserify": "^1.0.1",
     "postcss": "^8.4.5",
-    "postcss-loader": "^7.0.0",
+    "postcss-loader": "^8.0.0",
     "postcss-preset-env": "^9.0.0",
     "react-hot-loader": "^1.3.1",
     "react-refresh": "^0.14.0",