build(deps): update onnx requirement from <1.20.0,>1.12.0 to >1.12.0,<1.21.0 in /requirements (#21442)

build(deps): update onnx requirement in /requirements

Updates the requirements on [onnx](https://github.com/onnx/onnx) to permit the latest version.
- [Release notes](https://github.com/onnx/onnx/releases)
- [Changelog](https://github.com/onnx/onnx/blob/main/docs/Changelog-ml.md)
- [Commits](https://github.com/onnx/onnx/compare/v1.13.0...v1.20.0)

---
updated-dependencies:
- dependency-name: onnx
  dependency-version: 1.20.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Deependu <[email protected]>