build(deps): bump github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue from 1.15.20 to 1.15.21

build(deps): bump github.com/aws/aws-sdk-go-v2/feature/dynamodb/attributevalue from 1.15.20 to 1.15.21 #2545