Update ONNX to 1.12 (#11924)
Follow-ups that need to happen after this and before the next ORT release:
* Support SequenceMap with https://github.com/microsoft/onnxruntime/pull/11731
* Support signal ops with https://github.com/microsoft/onnxruntime/pull/11778
Follow-ups that need to happen after this but don't necessarily need to happen before the release:
* Implement LayerNormalization kernel for opset version 17: https://github.com/microsoft/onnxruntime/issues/11916
Fixes #11640
