build(deps-dev): bump postcss

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.23 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.23...8.4.31)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/sdk/vercel/examples/route-handler/package.json

@@ -20,7 +20,7 @@
     "@types/react": "^18.2.7",
     "@types/react-dom": "^18.2.4",
     "autoprefixer": "10.4.14",
-    "postcss": "8.4.23",
+    "postcss": "8.4.31",
     "tailwindcss": "3.3.2",
     "typescript": "5.1.6"
   }