The dns cluster operator is stuck in progressing state during upgrade of RHOCP

Issue

• The dns cluster operator shows the below error:

$ oc get co dns -o yaml
---output-trimmed----
message: 'DNS "default" reports Progressing=True: "Have 8 available DNS pods, want 9."
---output-trimmed----

• The dns pods show the below status:

$ oc get pods -n openshift-dns
dns-default-c5z42               1/2             Running           0 

• The dns pod's kube-rbac-proxy container showing:

$ oc logs dns-default-c5z42 -c kube-rbac-proxy
Unable to authenticate the request due to an error: context canceled
E1205 02:28:04.825922       1 webhook.go:111] Failed to make webhook authenticator request: Post "https://192.168.0.1:443/apis/authentication.k8s.io/v1/tokenreviews": context deadline exceeded