fix the uri

Author: hakuna-matatah

tests/pipelines/eks/awscli-cl2-load-with-addons-slos.yaml

@@ -51,7 +51,7 @@ spec:
     default: "https://raw.githubusercontent.com/awslabs/kubernetes-iteration-toolkit/main/tests/assets/amazon-eks-vpc.json"
     type: string
   - name: ng-cfn-url
-    default: "https://raw.githubusercontent.com/awslabs/kubernetes-iteration-toolkit/main/tests/assets/eks_nodeGroup_LaunchTemplate.yaml"
+    default: "https://raw.githubusercontent.com/awslabs/kubernetes-iteration-toolkit/main/tests/assets/eks_nodeGroup_launch_template.json"
     type: string
   - name: kubernetes-version
     type: string