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](https://github.com/postcss/autoprefixer/compare/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] <support@github.com>

package.json

@@ -45,7 +45,7 @@
     "@babel/eslint-parser": "^7.26.8",
     "@babel/preset-env": "^7.26.9",
     "@symfony/webpack-encore": "^5.1.0",
-    "autoprefixer": "^10.4.20",
+    "autoprefixer": "^10.4.21",
     "babel-loader": "^10.0.0",
     "core-js": "^3.41.0",
     "css-loader": "^7.1.2",