onnxruntime

5b4e2a63 - DML EP Register Opset 21 (#22547)

DML EP Register Opset 21 (#22547) ### Description This PR registers the following opset 21 operators: - Size-21 - CastLike-21 - ConstantOfShape-21 - Flatten-21 - Pad-21 - Transpose-21 ### Motivation and Context