Bump postcss and css-loader in /examples

Bumps [postcss](https://github.com/postcss/postcss) to 8.4.35 and updates ancestor dependency [css-loader](https://github.com/webpack-contrib/css-loader). These dependencies need to be updated together.


Updates `postcss` from 7.0.39 to 8.4.35
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@7.0.39...8.4.35)

Updates `css-loader` from 3.6.0 to 6.10.0
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/css-loader@v3.6.0...v6.10.0)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
- dependency-name: css-loader
  dependency-type: direct:development
...

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

examples/package.json

@@ -9,7 +9,7 @@
   },
   "devDependencies": {
     "babel-plugin-syntax-dynamic-import": "^6.18.0",
-    "css-loader": "^3.2.0",
+    "css-loader": "^6.10.0",
     "source-map-loader": "^0.2.4",
     "style-loader": "^1.0.0",
     "ts-loader": "~9.5.0",