chore(deps-dev): bump postcss from 8.4.27 to 8.4.31 (#156)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.27 to 8.4.31.
- [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/8.4.27...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
...

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package.json

@@ -31,7 +31,7 @@
     "engine.io": "6.5.1",
     "laravel-mix": "6.0.49",
     "mix-tailwindcss": "1.3.0",
-    "postcss": "8.4.27",
+    "postcss": "8.4.31",
     "postcss-import": "15.1.0",
     "resolve-url-loader": "5.0.0",
     "sass": "1.64.1",