Support onnxruntime 1.18.0 (#906)

scripts/wenet/export-onnx-streaming.py

@@ -28,11 +28,17 @@ def add_meta_data(filename: str, meta_data: Dict[str, str]):
         Key-value pairs.
     """
     model = onnx.load(filename)
+
+    while len(model.metadata_props):
+        model.metadata_props.pop()
+
     for key, value in meta_data.items():
         meta = model.metadata_props.add()
         meta.key = key
         meta.value = str(value)
 
+    #  model = onnx.version_converter.convert_version(model, 21)
+
     onnx.save(model, filename)