[Awaiting approval] Upload ONNX weights

[Automated] Converted using [Optimum](https://github.com/huggingface/optimum). Models will be merged manually by

@Xenova
once they have been checked with [Transformers.js](https://github.com/xenova/transformers.js).

onnx/decoder_model.onnx

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+size 8325522

onnx/decoder_model_merged.onnx

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+size 8417841

onnx/decoder_with_past_model.onnx

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onnx/encoder_model.onnx

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