build(deps): 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:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -79,7 +79,7 @@
     "@testing-library/svelte": "5.2.7",
     "@types/jest": "29.5.14",
     "@types/node": "22.13.10",
-    "autoprefixer": "10.4.20",
+    "autoprefixer": "10.4.21",
     "debug": "4.4.0",
     "embla-carousel-autoplay": "8.5.2",
     "embla-carousel-svelte": "8.5.2",