title: problem of installation of openshift serverless in openshift cluster
body: <p>I'm trying to install an openshift serverless operator in a openshift cluster version 4.8.21.This installation include knative-serving and knative-eventing operator.
  But when I check their installation I see this message : &quot;not supported to upgrade or downgrade accross the MAJOR version&quot;.
  And If I go to the pods logs I have : &quot;The Websocket connection could not be established or was disconnected&quot;.
  Can someone help me ?</p>