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] <support@github.com>

Author: dependabot[bot]

package.json

@@ -32,7 +32,7 @@
 		"astro": "5.4.2",
 		"astro-capo": "0.0.1",
 		"astrojs-service-worker": "2.0.0",
-		"autoprefixer": "10.4.20",
+		"autoprefixer": "10.4.21",
 		"cssnano": "7.0.6",
 		"cssnano-preset-advanced": "7.0.6",
 		"dotenv": "16.4.7",