Bump onnx in /examples/vai_quantizer/tensorflow2x/transformers_bert_qa

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] <[email protected]>

Author: dependabot[bot]

examples/vai_quantizer/tensorflow2x/transformers_bert_qa/requirements.txt

@@ -1,5 +1,5 @@
 datasets==2.9.0
-onnx==1.12.0
+onnx==1.13.0
 tf2onnx==1.13.0
 protobuf==3.20.1
 tensorflow==2.12.0