Update dependency boto3 to v1.42.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
boto3	1.42.18 → 1.42.21

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Release Notes

boto/boto3 (boto3)

v1.42.21

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• bugfix:s3: [botocore] Clarify payload_signing_enabled documentation to cover interaction with request_checksum_calculation

v1.42.20

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• api-change:cleanrooms: [botocore] Added support for publishing detailed metrics to CloudWatch for operational monitoring of collaborations, including query performance and resource utilization.
• api-change:identitystore: [botocore] This change introduces "Roles" attribute for User entities supported by AWS Identity Store SDK.

v1.42.19

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• api-change:connect: [botocore] Adds support for searching global contacts using the ActiveRegions filter, and pagination support for ListSecurityProfileFlowModules and ListEntitySecurityProfiles.
• api-change:endpoint-rules: [botocore] Update endpoint-rules client to latest version
• api-change:kafkaconnect: [botocore] This change sets the KafkaConnect GovCloud FIPS and FIPS DualStack endpoints to use kafkaconnect instead of kafkaconnect-fips as the service name. This is done to match the Kafka endpoints.

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