build(deps): bump terraform-aws-modules/eks/aws in /examples/basic (#80)

Bumps [terraform-aws-modules/eks/aws](https://github.com/terraform-aws-modules/terraform-aws-eks) from 20.13.0 to 20.15.0.
- [Release notes](https://github.com/terraform-aws-modules/terraform-aws-eks/releases)
- [Changelog](https://github.com/terraform-aws-modules/terraform-aws-eks/blob/master/CHANGELOG.md)
- [Commits](terraform-aws-modules/terraform-aws-eks@v20.13.0...v20.15.0)

---
updated-dependencies:
- dependency-name: terraform-aws-modules/eks/aws
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/basic/main.tf

@@ -42,7 +42,7 @@ data "aws_eks_cluster" "eks_cluster" {
 
 module "eks" {
   source  = "terraform-aws-modules/eks/aws"
-  version = "20.13.0"
+  version = "20.15.0"
 
   cluster_name                   = "${local.name}-cluster"
   cluster_version                = local.cluster_version