Bump onnx from 1.14.1 to 1.21.0rc1 in /src/model_converters/mxnet2onnx

Created by: dependabot[bot]

Bumps onnx from 1.14.1 to 1.21.0rc1.

Release notes

Sourced from onnx's releases.

v1.20.1

[!NOTE] This patch release includes important bug fixes to ONNX build.

What's Changed

• Export functions (onnx/onnx#7505)
• Revert ONNX CMake changes (onnx/onnx#7515)
• Export functions used in PyTorch (onnx/onnx#7524)
• Export protobuf symbols (onnx/onnx#7525)

Commits

• Bump version to 1.20.1rc1 by @​justinchuby in onnx/onnx#7561
• Cherry pick into 1.20.1 by @​cyyever @​justinchuby in onnx/onnx#7560
• Remove rc for 1.20.1 release by @​titaiwangms in onnx/onnx#7567

Full Changelog: https://github.com/onnx/onnx/compare/v1.20.0...v1.20.1

v1.20.0

ONNX v1.20.0 is now available with exciting new features! We would like to thank everyone who contributed to this release! Please visit onnx.ai to learn more about ONNX and associated projects.

Updated Op list:

Cast, CastLike, Constant, ConstantOfShape, DequantizeLinear, Flatten, Identity, If, Loop, Pad, QuantizeLinear, Reshape, Scan, Shape, Size, Squeeze, Transpose, Unsqueeze

Key Updates:

• Support for Python 3.14 via Python's stable ABI. (#7276)
• Opset 25
• 2-bit dtype support (#7446)
• A new "node determinism" attribute in operator schemas (#7176)

Breaking Changes and Deprecations

• Update manylinux_2014 -> manylinux_2_28 (#7151)
• Update attention gqa to use repeat interleave within repeat kv (#7274)
• Update required Python version to 3.10 and related fixes (#7220)
• Remove Python 3.9 wheel build (#7217)
• Remove deprecated methods (#7214)

Spec and Operator

• Add 2 bit support to onnx (#7446)
• Remove enforcement to node determinism attribute (#7473)
• Fix handling of empty inputs for the Softmax operator (#7206)
• Fix OneHotEncoder segfault due to missing input shape validation (#7302)
• Fix Attention backend test: correct dimension of Range input (#7300)
• Fix Range input rank in Attention op function definition (#7240)

... (truncated)

Commits

• See full diff in compare view

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