exclude onnxruntime==1.16.0 in CI (#7981)

Author: pmeier

.github/workflows/tests.yml

@@ -124,7 +124,7 @@ jobs:
  conda activate ci
  
  echo '::group::Install ONNX'
- pip install --progress-bar=off onnx onnxruntime
+ pip install --progress-bar=off onnx onnxruntime!=1.16.0
  echo '::endgroup::'
  
  echo '::group::Install testing utilities'