Update platform.yaml to include latest of Kyverno in CSM 1.6

Intermittently, Kyverno timeout issue is encountered during CSM upgrade. By introducing delay in post install hook we are introducing wait till Kyverno pods are stabilized and then going ahead with Kyverno policy upgrade.

manifests/platform.yaml

@@ -88,7 +88,7 @@ spec:
       - artifactory.algol60.net/csm-docker/stable/cray-nexus-setup:0.11.0
   - name: cray-kyverno
     source: csm-algol60
-    version: 1.6.4
+    version: 1.6.5
     namespace: kyverno
   - name: kyverno-policy
     source: csm-algol60