Update dependency boto3 to v1.21.42

This MR contains the following updates:

Package	Type	Update	Change
boto3	ironbank-pypi	patch	1.21.41 -> 1.21.42

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Release Notes

boto/boto3

v1.21.42

Compare Source

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• api-change:lightsail: [botocore] This release adds support to describe the synchronization status of the account-level block public access feature for your Amazon Lightsail buckets.
• api-change:rds: [botocore] Removes Amazon RDS on VMware with the deletion of APIs related to Custom Availability Zones and Media installation
• api-change:athena: [botocore] This release adds subfields, ErrorMessage, Retryable, to the AthenaError response object in the GetQueryExecution API when a query fails.

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