chore(deps-dev): bump autoprefixer in the postcss group (#1425)

Bumps the postcss group with 1 update: [autoprefixer](https://github.com/postcss/autoprefixer).


Updates `autoprefixer` from 10.4.20 to 10.4.21
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@10.4.20...10.4.21)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -78,7 +78,7 @@
     "@types/react": "19.0.10",
     "@types/react-dom": "19.0.4",
     "@types/react-syntax-highlighter": "15.5.13",
-    "autoprefixer": "10.4.20",
+    "autoprefixer": "10.4.21",
     "conventional-changelog": "6.0.0",
     "conventional-changelog-cli": "5.0.0",
     "conventional-changelog-conventionalcommits": "8.0.0",