chore(deps): bump postcss and next in /examples/integrate-with-next

Bumps [postcss](https://github.com/postcss/postcss) to 8.4.31 and updates ancestor dependency [next](https://github.com/vercel/next.js). These dependencies need to be updated together.


Updates `postcss` from 8.4.14 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@8.4.14...8.4.31)

Updates `next` from 13.1.5 to 13.5.5
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v13.1.5...v13.5.5)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
- dependency-name: next
  dependency-type: direct:production
...

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

examples/integrate-with-next/package.json

@@ -16,7 +16,7 @@
     "@types/node": "18.11.18",
     "@types/react": "18.0.27",
     "@types/react-dom": "18.0.10",
-    "next": "13.1.5",
+    "next": "13.5.5",
     "react": "18.2.0",
     "react-dom": "18.2.0",
     "typescript": "4.9.4",