fix(deps)(deps): update onnx requirement in /ml-service

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](onnx/onnx@v1.15.0...v1.22.0)

---
updated-dependencies:
- dependency-name: onnx
  dependency-version: 1.22.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ml-service/onnx-serving/requirements.txt

@@ -6,5 +6,5 @@ numpy>=2.5.1
 pydantic>=2.5.0
 torch>=2.1.0
 torchvision>=0.28.0
-onnx>=1.15.0
+onnx>=1.22.0
 onnxruntime-quantization>=0.1.3