docs: Update Karpenter example to use region argument in place of aliased AWS provider (#3538)

* feat(karpenter): support AWS Provider v6 region attribute

* docs(karpenter): remove unused aws.virginia provider reference

Author: moko-poi

examples/karpenter/README.md

@@ -102,7 +102,6 @@ Note that this example may create resources which cost money. Run `terraform des
 | Name | Version |
 |------|---------|
 | <a name="provider_aws"></a> [aws](#provider\_aws) | >= 6.13 |
-| <a name="provider_aws.virginia"></a> [aws.virginia](#provider\_aws.virginia) | >= 6.13 |
 | <a name="provider_helm"></a> [helm](#provider\_helm) | >= 3.0 |
 
 ## Modules

examples/karpenter/main.tf

@@ -2,11 +2,6 @@ provider "aws" {
   region = local.region
 }
 
-provider "aws" {
-  region = "us-east-1"
-  alias  = "virginia"
-}
-
 provider "helm" {
   kubernetes = {
     host                   = module.eks.cluster_endpoint
@@ -30,7 +25,7 @@ data "aws_availability_zones" "available" {
 }
 
 data "aws_ecrpublic_authorization_token" "token" {
-  provider = aws.virginia
+  region = "us-east-1"
 }
 
 locals {