upgrade k8s deploy yaml

Signed-off-by: shanghaikid <jiangruiyi@gmail.com>

attu-k8s-deploy.yaml

@@ -32,7 +32,7 @@ spec:
     spec:
       containers:
       - name: attu
-        image: zilliz/attu:v2.1.0
+        image: zilliz/attu:v2.2.8
         imagePullPolicy: IfNotPresent
         ports:
         - name: attu