Fix flaky parallel tool test with stronger model (#10183)

Co-authored-by: David S. Batista <[email protected]>

Author: vblagoje

test/components/generators/chat/test_openai.py

@@ -1023,6 +1023,7 @@ def __call__(self, chunk: StreamingChunk) -> None:
     def test_live_run_with_tools_streaming(self, tools):
         chat_messages = [ChatMessage.from_user("What's the weather like in Paris and Berlin?")]
         component = OpenAIChatGenerator(
+            model="gpt-5",
             tools=tools,
             streaming_callback=print_streaming_chunk,
             generation_kwargs={"stream_options": {"include_usage": True}},