Default channel on OCP 4.13 should be stable-4.13

The default upgrade channel on OCP 4.13 cluster is stable-4.12. It should be  stable-4.13.

# oc adm upgrade 
warning: Cannot display available updates:
  Reason: VersionNotFound
  Message: Unable to retrieve available updates: currently reconciling cluster version 4.13.0-ec.3 not found in the "stable-4.12" channel

Cluster version is 4.13.0-ec.3

Upstream is unset, so the cluster will use an appropriate default.

Channel: stable-4.12

4.13.0-ec.3

1/1

1. Install a 4.13 cluster
2. Check clusterversion.spec.channel
3.

The default channel on 4.13 cluster is stable-4.12

Expect the default channel to be stable-4.13