Update dependency boto3 to v1.21.16 (develop)

This MR contains the following updates:

Package	Type	Update	Change
boto3	dependencies	patch	==1.21.15 -> ==1.21.16

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Release Notes

boto/boto3

v1.21.16

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• api-change:comprehend: [botocore] Amazon Comprehend now supports extracting the sentiment associated with entities such as brands, products and services from text documents.

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