Update dependency boto3 to v1.35.21

This MR contains the following updates:

Package	Update	Change
boto3	patch	==1.35.20 -> ==1.35.21

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Release Notes

boto/boto3 (boto3)

v1.35.21

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• api-change:codebuild: [botocore] GitLab Enhancements - Add support for Self-Hosted GitLab runners in CodeBuild. Add group webhooks
• api-change:ecr: [botocore] The DescribeImageScanning API now includes fixAvailable, exploitAvailable, and fixedInVersion fields to provide more detailed information about the availability of fixes, exploits, and fixed versions for identified image vulnerabilities.
• api-change:ecs: [botocore] This is a documentation only release to address various tickets.
• api-change:lambda: [botocore] Support for JSON resource-based policies and block public access
• api-change:rds: [botocore] Updates Amazon RDS documentation with configuration information about the BYOL model for RDS for Db2.
• api-change:ssm: [botocore] Support for additional levels of cross-account, cross-Region organizational units in Automation. Various documentation updates.

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