Fix the OCP version used by Hub deployment

This is a workaround until the
openshift/installer#9763
PR is merged.

Then, revert this change.

Signed-off-by: Carlos Cardenosa <[email protected]>

Author: ccardenosa

ci-operator/config/openshift-kni/eco-ci-cd/openshift-kni-eco-ci-cd-ztp-left-shifting-kpi__ci-4.20.yaml

@@ -51,6 +51,7 @@ tests:
           {"name": "topology-aware-lifecycle-manager", "source": "prega-operators", "channel": "!default", "install_namespace": "openshift-talm", "target_namespaces": "", "operator_group": "topology-aware-lifecycle-manager"},
           {"name": "openshift-gitops-operator", "source": "prega-operators", "channel": "!default", "install_namespace": "openshift-gitops-operator", "target_namespaces": "", "operator_group": "gitops-operator-group"}
         ]
+      SET_SPECIFIC_RELEASE_IMAGE: quay.io/openshift-release-dev/ocp-release:4.20.0-ec.2-x86_64
       SHARED_HUB_CLUSTER_PROFILE: ztp-hub-preserved-prod-cluster_profile_dir
       SOCKS5_PROXY: socks5h://10.6.157.20:3124
     test: