chore(deps-dev): bump postcss from 8.4.1 to 8.4.4 (#2867)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.1 to 8.4.4.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.4.1...8.4.4)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -28,7 +28,7 @@
     "@wordpress/browserslist-config": "4.1.0",
     "autoprefixer": "^10.4.0",
     "eslint": "7.32.0",
-    "postcss": "8.4.1",
+    "postcss": "8.4.4",
     "postcss-import": "14.0.2",
     "postcss-nested": "5.0.6",
     "postcss-preset-env": "7.0.1",