Bug fixes

• Fixed the sagemaker_notebook_instance_encryption_at_rest_enabled query to correctly return SageMaker notebook instances with encryption at rest disabled. (#897)
• Fixed a syntax error in the iam_user_one_active_key query. (#895)
• Fixed the lambda_function_dead_letter_queue_configured query to properly check for Lambda functions with a DLQ (Dead Letter Queue) configured. (#893)
• Fixed the kms_cmk_policy_prohibit_public_access, sns_topic_policy_prohibit_public_access, and sns_topic_policy_prohibit_cross_account_access queries to correctly assess whether the associated IAM policies allow public access or cross-account access. (#858, #887)