deps(example): Bump the dependencies group

Bumps the dependencies group in /examples/nextjs-14-openai with 2 updates: [openai](https://github.com/openai/openai-node) and [postcss](https://github.com/postcss/postcss).


Updates `openai` from 4.52.1 to 4.52.2
- [Release notes](https://github.com/openai/openai-node/releases)
- [Changelog](https://github.com/openai/openai-node/blob/master/CHANGELOG.md)
- [Commits](openai/openai-node@v4.52.1...v4.52.2)

Updates `postcss` from 8.4.38 to 8.4.39
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.38...8.4.39)

---
updated-dependencies:
- dependency-name: openai
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

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

examples/nextjs-14-openai/package.json

@@ -12,7 +12,7 @@
     "@arcjet/next": "file:../../arcjet-next",
     "ai": "^3.2.15",
     "next": "^14.2.4",
-    "openai": "^4.52.1",
+    "openai": "^4.52.2",
     "openai-chat-tokens": "^0.2.8",
     "react": "^18",
     "react-dom": "^18"