Bump autoprefixer from 10.4.16 to 10.4.20

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.16 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@10.4.16...10.4.20)

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

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

package.json

@@ -14,7 +14,7 @@
   "dependencies": {
     "@headlessui/react": "^1.7.17",
     "@heroicons/react": "^2.0.18",
-    "autoprefixer": "^10.4.16",
+    "autoprefixer": "^10.4.20",
     "clsx": "^2.0.0",
     "focus-visible": "^5.2.0",
     "next": "13.5.4",