RBAC is moved to GA in Kubernetes 1.19+

[HofmannZ]

We're getting the following warnings when installing the helm chart on a Kubernetes cluster running version 1.19.

W0126 19:07:34.075634   34807 warnings.go:70] rbac.authorization.k8s.io/v1beta1 Role is deprecated in v1.17+, unavailable in v1.22+; use rbac.authorization.k8s.io/v1 Role
W0126 19:07:35.369282   34807 warnings.go:70] rbac.authorization.k8s.io/v1beta1 Role is deprecated in v1.17+, unavailable in v1.22+; use rbac.authorization.k8s.io/v1 Role
W0126 19:07:35.689226   34807 warnings.go:70] rbac.authorization.k8s.io/v1beta1 RoleBinding is deprecated in v1.17+, unavailable in v1.22+; use rbac.authorization.k8s.io/v1 RoleBinding
W0126 19:07:36.394350   34807 warnings.go:70] rbac.authorization.k8s.io/v1beta1 RoleBinding is deprecated in v1.17+, unavailable in v1.22+; use rbac.authorization.k8s.io/v1 RoleBinding

Running on:

NAME                    CHART VERSION   APP VERSION     DESCRIPTION                    
hashicorp/consul        0.29.0          1.9.2           Official HashiCorp Consul Chart