e2e-test: update-manifest-app1 (#2544)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: argocd-commenter-e2e-setup[bot]

app1/deployment/echoserver.yaml

@@ -13,7 +13,7 @@ spec:
         app: echoserver
     spec:
       containers:
-        - image: gcr.io/google_containers/echoserver:1.8
+        - image: gcr.io/google_containers/echoserver:1.9
           name: echoserver
           ports:
             - containerPort: 8080