Bump onnx from 1.13.1 to 1.16.0 in /src/bindings/python

Bumps [onnx](https://github.com/onnx/onnx) from 1.13.1 to 1.16.0.
- [Release notes](https://github.com/onnx/onnx/releases)
- [Changelog](https://github.com/onnx/onnx/blob/main/docs/Changelog-ml.md)
- [Commits](onnx/onnx@v1.13.1...v1.16.0)

---
updated-dependencies:
- dependency-name: onnx
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

src/bindings/python/constraints.txt

@@ -1,5 +1,5 @@
 # used in multiple components
-onnx==1.13.1  # Python bindings, ONNX Frontend
+onnx==1.16.0  # Python bindings, ONNX Frontend
 numpy>=1.16.6,<1.26  # Python bindings, frontends
 protobuf>=3.18.1,<4.0.0  # Python bindings, frontends