Bump onnx in /examples/deployment/neural_engine/mrpc/bert_mini

Bumps [onnx](https://github.com/onnx/onnx) from 1.12.0 to 1.13.0.
- [Release notes](https://github.com/onnx/onnx/releases)
- [Changelog](https://github.com/onnx/onnx/blob/main/docs/Changelog.md)
- [Commits](onnx/onnx@v1.12.0...v1.13.0)

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

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

examples/deployment/neural_engine/mrpc/bert_mini/requirements.txt

@@ -5,6 +5,6 @@ datasets >= 1.8.0
 sentencepiece != 0.1.92
 protobuf
 torch==1.13.0
-onnx==1.12.0
+onnx==1.13.0
 onnxruntime==1.13.1
 onnxruntime-extensions