Calling the sagemaker_containers package which is deprecated.

**Link to the notebook**
https://github.com/aws/amazon-sagemaker-examples/blob/master/introduction_to_amazon_algorithms/xgboost_abalone/xgboost_abalone_dist_script_mode.ipynb

**Describe the bug**
The script is using the sagemaker_containers package which is deprecated. Please update the script to use the Sagemaker Training Toolkit.

**To reproduce**
n/a

**Logs**
n/a