Bump autoprefixer from 10.4.20 to 10.4.21 (#791)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -66,7 +66,7 @@
     "@typescript-eslint/eslint-plugin": "8.28.0",
     "@typescript-eslint/parser": "8.28.0",
     "@vitejs/plugin-react": "4.3.4",
-    "autoprefixer": "10.4.20",
+    "autoprefixer": "10.4.21",
     "eslint": "9.23.0",
     "globals": "16.0.0",
     "jsdom": "26.0.0",