Bump autoprefixer from 10.4.13 to 10.4.20

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.13 to 10.4.20.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@10.4.13...10.4.20)

---
updated-dependencies:
- dependency-name: autoprefixer
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -16,7 +16,7 @@
     "@types/google.analytics": "0.0.42",
     "@types/node": "^18",
     "@wavevision/nette-webpack": "^2.0.0",
-    "autoprefixer": "^10.4.12",
+    "autoprefixer": "^10.4.20",
     "clean-webpack-plugin": "^4.0.0",
     "cross-env": "^7.0.2",
     "css-loader": "^6.6.0",