Bump autoprefixer from 10.4.19 to 10.4.20

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.19 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@10.4.19...10.4.20)

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

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

Author: dependabot[bot]

package-lock.json

@@ -23,7 +23,7 @@
     "react": "^18.0.0",
     "react-dom": "^18.0.0",
     "@mdx-js/react": "^3.0.0",
-    "autoprefixer": "^10.4.7",
+    "autoprefixer": "^10.4.20",
     "core-js": "^3.27.2",
     "mobx": "^6.13.1",
     "postcss": "^8.4.40",