examples: update all examples to use the new LLMContextAggregatorPair tuple

examples/foundational/26h-gemini-live-vertex-function-calling.py

@@ -139,15 +139,15 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     llm.register_function("get_restaurant_recommendation", fetch_restaurant_recommendation)
 
     context = LLMContext([{"role": "user", "content": "Say hello."}])
-    context_aggregator = LLMContextAggregatorPair(context)
+    user_aggregator, assistant_aggregator = LLMContextAggregatorPair(context)
 
     pipeline = Pipeline(
         [
             transport.input(),
-            context_aggregator.user(),
+            user_aggregator,
             llm,
             transport.output(),
-            context_aggregator.assistant(),
+            assistant_aggregator,
         ]
     )