build(deps): bump autoprefixer from 10.4.12 to 10.4.13 (#4904)

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.12 to 10.4.13.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@10.4.12...10.4.13)

---
updated-dependencies:
- dependency-name: autoprefixer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

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

@@ -32,7 +32,7 @@
   "dependencies": {
     "@metalsmith/markdown": "^1.6.0",
     "@metalsmith/permalinks": "^2.4.0",
-    "autoprefixer": "^10.4.12",
+    "autoprefixer": "^10.4.13",
     "fs-extra": "^10.1.0",
     "graceful-fs": "^4.2.10",
     "handlebars": "^4.7.7",