Loosen peer dependency on openai

Currently, package.json specifies a `peerDependency` for the `openai` library at exactly version `4.47.1`. This PR loosens the dependency to any version of the library backward-compatible with 4.47.1. The `openai-node` repo describes their SemVer policy here: https://github.com/openai/openai-node?tab=readme-ov-file#semantic-versioning

public-packages/llm-client/package.json

@@ -52,7 +52,7 @@
   "peerDependencies": {
     "@anthropic-ai/sdk": "^0.22.0",
     "@google/generative-ai": "^0.21.0",
-    "openai": "4.47.1"
+    "openai": "^4.47.1"
   },
   "devDependencies": {
     "@anthropic-ai/sdk": "^0.22.0",