Bump onnx from 1.16.1 to 1.17.0 in /backend

Bumps [onnx](https://github.com/onnx/onnx) from 1.16.1 to 1.17.0.
- [Release notes](https://github.com/onnx/onnx/releases)
- [Changelog](https://github.com/onnx/onnx/blob/main/docs/Changelog-ml.md)
- [Commits](onnx/onnx@v1.16.1...v1.17.0)

---
updated-dependencies:
- dependency-name: onnx
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]