feat: py-onnx-1.15.0

Split off from !789 (closed).

spack-environment/dev/spack.yaml

@@ -76,6 +76,7 @@ spack:
   - py-scipy
   - py-seaborn
   - py-toml
+  - py-torch
   - py-uproot
   - py-wurlitzer
   - py-yapf