Fix bug in AWS Bedrock conversation summarization. It was using an out-of-date pattern (the _client property no longer exists)

src/pipecat/services/aws/llm.py

@@ -840,8 +840,11 @@ class AWSBedrockLLMService(LLMService):
 
             request_params["system"] = [{"text": summary_prompt}]
 
+            async with self._aws_session.client(
+                service_name="bedrock-runtime", **self._aws_params
+            ) as client:
                 # Call Bedrock without streaming
-            response = self._client.converse(**request_params)
+                response = await client.converse(**request_params)
 
                 # Extract the response text
                 if (