Update notebook images version 1.9.1 (#22)

As Kubeflow released new notebook images
https://github.com/kubeflow/kubeflow/releases/tag/v1.9.1

Author: sanketsudake

charts/kf-notebooks/Chart.yaml

@@ -15,13 +15,13 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 0.1.1
+version: 0.1.2
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to
 # follow Semantic Versioning. They should reflect the version the application is using.
 # It is recommended to use it with quotes.
-appVersion: "v1.9.0"
+appVersion: "v1.9.1"
 
 keywords:
   - kubeflow