Remove onnx to avoid redundancy with py-onnx

spack-environment/dev/spack.yaml

@@ -43,7 +43,6 @@ spack:
     - lhapdf
     - madx
     - npsim
-    - onnx
     - opencascade
     - osg-ca-certs
     - phonebook-cli

spack-environment/packages.yaml

@@ -177,9 +177,6 @@ packages:
     - '@1.3.0'
     - +http
     - any_of: [+geocad, -geocad]
-  onnx:
-    require:
-    - '@1.13.1'
   opencascade:
     require:
     - '@7.7.1'