Bump postcss and autoprefixer

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


Updates `postcss` from 5.2.18 to 8.4.35
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/commits/8.4.35)

Updates `autoprefixer` from 6.7.7 to 10.4.19
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@6.7.7...10.4.19)

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

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

package.json

@@ -22,7 +22,7 @@
     "morgan": "^1.10.0"
   },
   "devDependencies": {
-    "autoprefixer": "^6.3.6",
+    "autoprefixer": "^10.4.19",
     "bootstrap": "^5.3.3",
     "copy-webpack-plugin": "^9.0.1",
     "css-loader": "^6.7.3",