[Minor] Include StreamingInput in inputs package (#33856)

Signed-off-by: Nick Hill <nickhill123@gmail.com>

tests/v1/streaming_input/test_async_llm_streaming.py

@@ -7,7 +7,7 @@ from unittest.mock import AsyncMock, MagicMock
 
 import pytest
 
-from vllm.inputs.data import StreamingInput
+from vllm.inputs import StreamingInput
 from vllm.outputs import RequestOutput
 from vllm.sampling_params import RequestOutputKind, SamplingParams
 from vllm.v1.engine.async_llm import AsyncLLM