Bump postcss and next (#4)

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 13.4.12 to 13.5.6
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](vercel/next.js@v13.4.12...v13.5.6)

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

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

Author: dependabot[bot]

RetrievalAugmentedGeneration/frontend/frontend_js/package-lock.json

@@ -24,7 +24,7 @@
     "eslint": "8.43.0",
     "eslint-config-next": "13.4.6",
     "iframe-resizer-react": "^1.1.0",
-    "next": "^13.4.12",
+    "next": "^13.5.6",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
     "typescript": "^5.1.3"