Bump onnx from 1.18.0 to 1.21.0 in /onnxruntime/python/tools/transformers/models/llama#1011

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dependabot/pip/onnxruntime/python/tools/transformers/models/llama/onnx-1.21.0intel/onnxruntime:dependabot/pip/onnxruntime/python/tools/transformers/models/llama/onnx-1.21.0Copy head branch name to clipboard