How can I refactor terraform module that creates vpc?

I found an example of an ML flow deployment on aws using terraform here: https://github.com/Glovo/terraform-aws-mlflow/blob/master/terratest/examples/main.tf. The problem is that it declares a "vpc" module, and it seems this is deprecated with the latest version of terraform (v 1.4.6). The vpc is declared like this

    module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "2.44.0"

  name               = "mlflow-${random_id.id.hex}"
  cidr               = "10.0.0.0/16"
  azs                = ["eu-west-1a", "eu-west-1b", "eu-west-1c"]
  private_subnets    = ["10.0.1.0/24", "10.0.2.0/24", "10.0.3.0/24"]
  public_subnets     = ["10.0.101.0/24", "10.0.102.0/24", "10.0.103.0/24"]
  database_subnets   = ["10.0.201.0/24", "10.0.202.0/24", "10.0.203.0/24"]
  enable_nat_gateway = true

  tags = {
    "built-using" = "terratest"
    "env"         = "test"
  }
}

The vpc is then referenced in the mlf flow module:

module "mlflow" {
  source = "../../"

  unique_name = "mlflow-terratest-${random_id.id.hex}"
  tags = {
    "owner" = "terratest"
  }
  vpc_id                            = module.vpc.vpc_id
  database_subnet_ids               = module.vpc.database_subnets
  service_subnet_ids                = module.vpc.private_subnets
  load_balancer_subnet_ids          = var.is_private ? module.vpc.private_subnets : module.vpc.public_subnets
  load_balancer_ingress_cidr_blocks = var.is_private ? [module.vpc.vpc_cidr_block] : ["0.0.0.0/0"]
  load_balancer_is_internal         = var.is_private
  artifact_bucket_id                = var.artifact_bucket_id
  database_password_secret_arn      = aws_secretsmanager_secret_version.db_password.secret_id
  database_skip_final_snapshot      = true
}

My guess is that I would have to refactor this using resource declarations for the vpc instead of the module. The thing I can't understand is why are the subnets declared as a list of strings in the vpc module, and then assigned to subnet id variables in the ml flow module? And how would I do this in the latest version of terraform?

Any help would be much appreciated.

You don't need to refactor that module, just update the version to the latest one (4.0.2) you're using a really old one.
Recommendation: <br> Every time that you see a module calling in a terraform repo go to the Terraform registry and check the versions, documentation, and official examples/repos. <br>
https://registry.terraform.io/modules/terraform-aws-modules/vpc/aws/4.0.2