Switch aws provider to the hashicorp namespace

From this warning:

╷
│ Warning: Additional provider information from registry
│
│ The remote registry returned warnings for
│ registry.opentofu.org/opentofu/aws:
│ - You are using opentofu/aws instead of hashicorp/aws. This provider is
│ maintained by HashiCorp and the OpenTofu project only builds the provider
│ binaries from the source code. Both the opentofu/ and hashicorp/ namespaces
│ in the OpenTofu Registry contain the OpenTofu-built provider binaries based
│ on the HashiCorp source code. To avoid configuration errors, we recommend
│ using the hashicorp/ namespaced providers.
╵

capa-controller-role/giantswarm-capa-role.tf

@@ -7,7 +7,7 @@ locals {
 terraform {
   required_providers {
     aws = {
-      source  = "opentofu/aws"
+      source  = "hashicorp/aws"
       version = "5.81.0"
     }
   }