Fix azure_openai.py

Azure OpenAI api key (when not using active directory authentication) was not being passed to the underlying openai object.

pandasai/llm/azure_openai.py

@@ -176,6 +176,7 @@ def _client_params(self) -> Dict[str, any]:
             "azure_deployment": self.deployment_name,
             "azure_ad_token": self.azure_ad_token,
             "azure_ad_token_provider": self.azure_ad_token_provider,
+            "api_key": self.api_token,
         }
         return {**client_params, **super()._client_params}