bugfix: remove sagemaker upgrade line; pin to v1 range

[aaronmarkham]

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[TEChopra1000]

Seeing this error when running:

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-2-0f073dcf364f> in <module>
      8 
      9 # Specify training container
---> 10 from sagemaker.amazon.amazon_estimator import get_image_uri
     11 container = get_image_uri(boto3.Session().region_name, 'linear-learner')
     12 

ImportError: cannot import name 'get_image_uri'

From the python sdk update:

Image URI Functions (e.g. get_image_uri)
The following functions have been removed in favor of sagemaker.image_uris.retrieve():
sagemaker.amazon_estimator.get_image_uri()
...
For more information about usage, see sagemaker.image_uris.retrieve().