fix(dns): Fix network policy syntax

apps/k8s01/dns/networkpolicy.yaml

@@ -12,9 +12,9 @@ spec:
       - namespaceSelector:
           matchLabels:
             kubernetes.io/metadata.name: kube-system
-          podSelector:
-            matchLabels:
-              k8s-app: kube-dns
+        podSelector:
+          matchLabels:
+            k8s-app: kube-dns
     ports:
       - port: 53
         protocol: UDP