Update dependency boto3 to v1.35.20

This MR contains the following updates:

Package	Update	Change
boto3	patch	==1.35.19 -> ==1.35.20

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Release Notes

boto/boto3 (boto3)

v1.35.20

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• api-change:bedrock: [botocore] This feature adds cross account s3 bucket and VPC support to ModelInvocation jobs. To use a cross account bucket, pass in the accountId of the bucket to s3BucketOwner in the ModelInvocationJobInputDataConfig or ModelInvocationJobOutputDataConfig.
• api-change:iot: [botocore] This release adds additional enhancements to AWS IoT Device Management Software Package Catalog and Jobs. It also adds SBOM support in Software Package Version.
• api-change:medialive: [botocore] Removing the ON_PREMISE enum from the input settings field.
• api-change:organizations: [botocore] Doc only update for AWS Organizations that fixes several customer-reported issues
• api-change:pca-connector-scep: [botocore] This is a general availability (GA) release of Connector for SCEP, a feature of AWS Private CA. Connector for SCEP links your SCEP-enabled and mobile device management systems to AWS Private CA for digital signature installation and certificate management.
• api-change:rds: [botocore] Launching Global Cluster tagging.

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