* Update Kubernetes to v1.21.0
* Update to golang v1.16.2
* Update dependent modules to track with upstream
* Switch to upstream flannel
* Track changes to upstream cloud-controller-manager and FeatureGates
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>
rancher/flannel ➡️ k3s-io/flannel
rancher/go-powershell ➡️ k3s-io/go-powershell
Part of https://github.com/rancher/k3s/issues/2189
Signed-off-by: Jacob Blain Christen <jacob@rancher.com>