KEDA prom auto scale notebook is broken

[anggao]

Describe the bug

The notebook testing keda_prom_auto_scale.ipynb is broken

To reproduce

make test_notebooks

Expected behaviour

Pass test

Environment

master branch

Model Details

• Images of your model: [Output of: kubectl get seldondeployment -n <yourmodelnamespace> <seldondepname> -o yaml | grep image: where <yourmodelnamespace>]
• Logs of your model: [You can get the logs of your model by running kubectl logs -n <yourmodelnamespace> <seldonpodname> <container>]