fix bug: quantization shape inference (#12983)
model path for onnx.shape_inference.infer_shapes_path and the external
data needs to be under the same directory as doc here:
https://github.com/onnx/onnx/blob/f4dea9e68b36f834947062e56257ae3c0ebc5284/docs/PythonAPIOverview.md#shape-inference-a-large-onnx-model-2gb
