build(deps-dev): bump autoprefixer from 10.4.20 to 10.4.21 (#2689)

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

Author: dependabot[bot]

package.json

@@ -49,7 +49,7 @@
     "@typescript-eslint/eslint-plugin": "^8.26.1",
     "@typescript-eslint/parser": "^8.26.1",
     "@vitest/coverage-v8": "^3.0.5",
-    "autoprefixer": "^10.4.20",
+    "autoprefixer": "^10.4.21",
     "commitlint": "^19.8.0",
     "concurrently": "^9.1.2",
     "eslint": "^9.21.0",