authentication is not available after update

Issue

After updating the cluster the authentication operator is failing:

$ oc get clusterversion
NAME     VERSION  AVAILABLE  PROGRESSING  SINCE  STATUS
version           False      True         2d     Unable to apply 4.7.43: the cluster operator authentication has not yet successfully rolled out

$ oc get co authentication -o yaml
...
    message: 'OAuthServiceCheckEndpointAccessibleControllerDegraded: Get "https://172.30.53.50:443/healthz":
      dial tcp 172.30.53.50:443: connect: connection refused'
    reason: OAuthServiceCheckEndpointAccessibleController_SyncError
    status: 'True'
    type: Degraded
...