Update dependency boto3 to v1.21.1 (develop)

This MR contains the following updates:

Package	Type	Update	Change
boto3	dependencies	patch	==1.21.0 -> ==1.21.1

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Release Notes

boto/boto3

v1.21.1

Compare Source

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• api-change:ec2: [botocore] Documentation updates for EC2.
• api-change:budgets: [botocore] Adds support for auto-adjusting budgets, a new budget method alongside fixed and planned. Auto-adjusting budgets introduces new metadata to configure a budget limit baseline using a historical lookback average or current period forecast.
• api-change:ce: [botocore] AWS Cost Anomaly Detection now supports SNS FIFO topic subscribers.
• api-change:glue: [botocore] Support for optimistic locking in UpdateTable
• api-change:ssm: [botocore] Assorted ticket fixes and updates for AWS Systems Manager.

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