Fix cert manager source

Author: bonclay7

modules/add-ons/adot-operator/main.tf

@@ -1,5 +1,5 @@
 module "cert_manager" {
-  source = "github.com/aws-observability/terraform-aws-eks-blueprints/modules/kubernetes-addons/cert-manager"
+  source = "github.com/aws-ia/terraform-aws-eks-blueprints/modules/kubernetes-addons/cert-manager"
   count  = var.enable_cert_manager ? 1 : 0
 
   helm_config   = { version = "v1.8.2" }