Ensure Enhanced VPC routing should be enabled for AWS Redshift Clusters

Enhanced vpc routing has been disabled. Enhanced VPC routing ensures that not traffic or data flows through the internet at any times.

In AWS Console -

1. Sign in to the AWS Console and open the Amazon Redshift console.
2. On the navigation menu, select Clusters.
3. To display the Additional configurations section, choose to switch off Use defaults.
4. Set Enhanced VPC routing to Enabled.
5. Select Create cluster.

In Terraform -

1. In the aws_redshift_cluster resource, set 'enhanced_vpc_routing' to 'true'.

References:
https://docs.aws.amazon.com/redshift/latest/mgmt/managing-clusters-vpc.html
https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/redshift_cluster#enhanced_vpc_routing