ok.... need a sanity check. running rancher standalone right now which I should probably properly deploy 'in' my cluster (not best practice... but shrug) It is 2.6.6 and the local k3s is v1.23.6+k3s1 my downstream cluster is on GKE and is at v1.23.8-gke.1900. I would like to upgrade to RKE2. ignoring my HA issues with Rancher (I'll figure out that with the infamous, 'later')... what is the best upgrade path?