Remove unnecessary type ignore

Author: paxiaatucsdedu

libs/oci/tests/integration_tests/chat_models/test_tool_calling.py

@@ -428,7 +428,7 @@ def should_continue(state: MessagesState):
 
     # Invoke agent with a diagnostic scenario
     result = agent.invoke(
-        {  # type: ignore[arg-type]
+        {
             "messages": [
                 SystemMessage(content=system_prompt),
                 HumanMessage(