Pin onnx on Windows

Author: jeff-shepherd

how-to-use-azureml/automated-machine-learning/automl_env.yml

@@ -20,6 +20,7 @@ dependencies:
   - matplotlib==3.7.1
   - xgboost==1.5.2
   - prophet==1.1.4
+  - onnx==1.16.1
   - setuptools-git==1.2
   - spacy==3.7.4
   - https://aka.ms/automl-resources/packages/en_core_web_sm-3.7.1.tar.gz