Bump autoprefixer from 10.4.20 to 10.4.21

Bumps [autoprefixer](https://github.com/postcss/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
...

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

Author: dependabot[bot]

package-lock.json

@@ -49,7 +49,7 @@
     "@types/node": "^22",
     "@types/react": "^18",
     "@types/react-dom": "^18",
-    "autoprefixer": "^10.4.20",
+    "autoprefixer": "^10.4.21",
     "encoding": "^0.1.13",
     "eslint": "^9.21.0",
     "eslint-config-next": "^15.1.7",