Update redis image in gitops example

Signed-off-by: devanshuVmware <devanshu.d@broadcom.com>

examples/gitops/guestbook/all-in-one.yml

@@ -38,7 +38,7 @@ spec:
     spec:
       containers:
       - name: primary
-        image: registry.k8s.io/redis:e2e  #! or just image: redis
+        image: registry.k8s.io/redis@sha256:cb111d1bd870a6a471385a4a69ad17469d326e9dd91e0e455350cacf36e1b3ee  #! or just image: redis
         resources:
           requests:
             cpu: 120m