Bump terraform-aws-modules/eks/aws from 19.20.0 to 19.21.0 in /aws

Bumps [terraform-aws-modules/eks/aws](https://github.com/terraform-aws-modules/terraform-aws-eks) from 19.20.0 to 19.21.0.
- [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@v19.20.0...v19.21.0)

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

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

aws/main.tf

@@ -65,7 +65,7 @@ module "vpc" {
 
 module "eks" {
   source  = "terraform-aws-modules/eks/aws"
-  version = "19.20.0"
+  version = "19.21.0"
 
   cluster_name    = var.cluster_name
   cluster_version = var.cluster_version