Bump onnx from 1.16.0 to 1.16.2 in /rastervision_pytorch_learner

Bumps [onnx](https://github.com/onnx/onnx) from 1.16.0 to 1.16.2.
- [Release notes](https://github.com/onnx/onnx/releases)
- [Changelog](https://github.com/onnx/onnx/blob/main/docs/Changelog-ml.md)
- [Commits](onnx/onnx@v1.16.0...v1.16.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

rastervision_pytorch_learner/requirements.txt

@@ -12,4 +12,4 @@ psutil==6.0.0
 opencv-python-headless==4.10.0.84
 matplotlib==3.9.1
 tqdm==4.66.5
-onnx==1.16.0
+onnx==1.16.2