user-personalization-with-exploration.ipynb sample is missing test data from S3

The notebook at https://github.com/aws-samples/amazon-personalize-samples/blob/master/next_steps/core_use_cases/user_personalization/user-personalization-with-exploration.ipynb is missing the required sample data to use in the notebook.

The error occurs at cell 28:
```
interaction_dataset_key = "sample-dataset/interactions-sample.csv"
items_dataset_key = "sample-dataset/items-with-creation-timestamp-sample.csv"
interactions_file = os.getcwd() + "/interaction_raw.csv"
items_metadata_file = os.getcwd() + "/items_raw.csv"

s3_client.download_file(personalize_s3_bucket, interaction_dataset_key, interactions_file)
s3_client.download_file(personalize_s3_bucket, items_dataset_key, items_metadata_file)
```

The error being a generic object not found when calling s3:
`ClientError: An error occurred (404) when calling the HeadObject operation: Not Found`

I tried `ls` on the `personalize-cli-json-models` s3 bucket across every AWS region but found no data.

Is it possible get the data from somewhere else?