R example use old version of Sagemaker SDK

I found that the R examples use old version of Sagemaker SDK, and fail.
Fixed by forcing the installation of SDK 1.72.0, just after loading reticulate.

library(reticulate)
py_install('sagemaker==1.72.0',pip='TRUE')
sagemaker <- import('sagemaker')

Locate the R examples that load SageMaker through reticulate and identify which ones fail with the current SDK. Compare their dependency setup with the reported sagemaker==1.72.0 workaround, then run the affected examples to verify that the examples complete successfully with the corrected setup.

Written by the indexing model from the issue text.