<!-- **Describe the bug** <!-- I want to run the order ``python -m tf2onnx.convert --saved-model new_saved_model/ --output model.onnx --opset 11`` to convert the model format from .pb to .onnx, but an error ocurred. --> **System information** - OS Platform and Distribution (e.g., Linux Ubuntu 18.04*): Windows 11 - TensorFlow Version: 2.11.0 - Python version: 3.7.16 - ONNX version (if applicable, e.g. 1.11*): 1.12.0 - ONNXRuntime version (if applicable, e.g. 1.11*): 1.14.1 **Screenshots**       