add await to async

Author: anujhydrabadi

src/openai/lib/azure.py

@@ -619,7 +619,7 @@ async def _prepare_options(self, options: FinalRequestOptions) -> FinalRequestOp
             # should never be hit
             raise ValueError("Unable to handle auth")
 
-        return super()._prepare_options(options)
+        return await super()._prepare_options(options)
 
     async def _configure_realtime(self, model: str, extra_query: Query) -> tuple[httpx.URL, dict[str, str]]:
         auth_headers = {}