Bump axios and openai in /examples/chat-vanilla-js-hosted

Removes [axios](https://github.com/axios/axios). It's no longer used after updating ancestor dependency [openai](https://github.com/openai/openai-node). These dependencies need to be updated together.


Removes `axios`

Updates `openai` from 3.2.1 to 4.17.4
- [Release notes](https://github.com/openai/openai-node/releases)
- [Changelog](https://github.com/openai/openai-node/blob/master/CHANGELOG.md)
- [Commits](openai/openai-node@v3.2.1...v4.17.4)

---
updated-dependencies:
- dependency-name: axios
  dependency-type: indirect
- dependency-name: openai
  dependency-type: direct:production
...

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

examples/chat-vanilla-js-hosted/package.json

@@ -17,6 +17,6 @@
   "dependencies": {
     "chalk": "^5.2.0",
     "dotenv": "^16.0.3",
-    "openai": "^3.2.1"
+    "openai": "^4.17.4"
   }
 }