Bump postcss from 8.2.3 to 8.2.4

Bumps [postcss](https://github.com/postcss/postcss) from 8.2.3 to 8.2.4.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.2.3...8.2.4)

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

package.json

@@ -52,7 +52,7 @@
     "linkinator": "^2.13.0",
     "lockfile-lint": "^4.3.7",
     "npm-run-all": "^4.1.5",
-    "postcss": "^8.2.3",
+    "postcss": "^8.2.4",
     "postcss-cli": "^8.3.1",
     "purgecss": "^3.1.3",
     "stylelint": "^13.8.0",