Require hashicorp/aws >= 6.4.0

We're using the `skip_destroy` argument on `resource/aws_s3_bucket_public_access_block`.

Author: kurtismash

versions.tf

@@ -8,7 +8,7 @@ terraform {
     }
     aws = {
       source  = "hashicorp/aws"
-      version = "> 6.0.0"
+      version = ">= 6.4.0"
     }
   }
 }