Rancher's restricted PodSecurityPolicy does not prevent containers from running as a privileged user

Impact The restricted pod security policy PSP, provided in Rancher versions from 2.0 up to and including 2.6.3, has a deviation from the upstream restricted policy provided in Kubernetes, in which Rancher's PSP has runAsUser set to runAsAny, while upstream has runAsUser set to MustRunAsNonRoot...