Update terraform-aws-modules/vpc/aws requirement from ~> 3.16.0 to ~> 3.18.1

Updates the requirements on [terraform-aws-modules/vpc/aws](https://github.com/terraform-aws-modules/terraform-aws-vpc) to permit the latest version.
- [Release notes](https://github.com/terraform-aws-modules/terraform-aws-vpc/releases)
- [Changelog](https://github.com/terraform-aws-modules/terraform-aws-vpc/blob/master/CHANGELOG.md)
- [Commits](terraform-aws-modules/terraform-aws-vpc@v3.16.0...v3.18.1)

---
updated-dependencies:
- dependency-name: terraform-aws-modules/vpc/aws
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

aws/main.tf

@@ -37,7 +37,7 @@ data "aws_availability_zones" "available" {}
 
 module "vpc" {
   source  = "terraform-aws-modules/vpc/aws"
-  version = "~> 3.16.0"
+  version = "~> 3.18.1"
 
   name                 = "${var.cluster_name}-vpc"
   cidr                 = local.vpc_cidr