CoreDNS upgrade from v1.20 to v1.21 fails — image cannot be pulled

CoreDNS upgrade from v1.20 to v1.21 fails — image cannot be pulled: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). When upgrading a workload cluster managed by KCP from Kubernetes v1.20 to v1.21, the CoreDNS pods end up in ImagePullBackOff after KCP rolls the…