Bump onnx from 1.6 to 1.13.0

Bumps [onnx](https://github.com/onnx/onnx) from 1.6 to 1.13.0.
- [Release notes](https://github.com/onnx/onnx/releases)
- [Changelog](https://github.com/onnx/onnx/blob/main/docs/Changelog.md)
- [Commits](https://github.com/onnx/onnx/compare/v1.6.0...v1.13.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/setup.py b/setup.py
index 759fad9..f581b47 100644
--- a/setup.py
+++ b/setup.py
@@ -420,7 +420,7 @@
     python_requires='>=3',
     install_requires=[
         'numpy >=1.16,<2.0',  #1.16
-        'onnx==1.6',
+        'onnx==1.13.0',
         'deprecated',
         'pytest',
         'unittest-xml-reporting',