chore(deps-dev): bump postcss-loader from 4.2.0 to 5.0.0

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 4.2.0 to 5.0.0.
- [Release notes](https://github.com/webpack-contrib/postcss-loader/releases)
- [Changelog](https://github.com/webpack-contrib/postcss-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/postcss-loader/compare/v4.2.0...v5.0.0)

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

package.json

@@ -28,7 +28,7 @@
     "css-loader": "^5.0.0",
     "postcss": "^8.1.10",
     "postcss-import": "^13.0.0",
-    "postcss-loader": "^4.1.0",
+    "postcss-loader": "^5.0.0",
     "postcss-url": "^10.1.1",
     "tailwindcss": "2.0.3"
   }