Bump onnx2torch from 1.5.12 to 1.5.15

Bumps [onnx2torch](https://github.com/ENOT-AutoDL/onnx2torch) from 1.5.12 to 1.5.15.
- [Release notes](https://github.com/ENOT-AutoDL/onnx2torch/releases)
- [Commits](ENOT-AutoDL/onnx2torch@v1.5.12...v1.5.15)

---
updated-dependencies:
- dependency-name: onnx2torch
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pyproject.toml

@@ -41,7 +41,7 @@ dependencies = [
   "lxml==5.1.0",
   "numpy==1.24.4",
   "onnx==1.14.1",
-  "onnx2torch==1.5.12",
+  "onnx2torch==1.5.15",
   "onnxruntime==1.16.1",
   "pillow==10.1.0",
   "pint==0.21.1",