Upgrade Velero ClusterRoleBinding to use v1 API

[zubron]

Describe the problem/challenge you have
We are using rbac.authorization.k8s.io/v1beta1 for creating the Velero ClusterRoleBinding which will be removed in v1.22.

Our current install logs show the following message:

rbac.authorization.k8s.io/v1beta1 ClusterRoleBinding is deprecated in v1.17+, unavailable in v1.22+; use rbac.authorization.k8s.io/v1 ClusterRoleBinding

This is similar to #2505.

Describe the solution you'd like
We need to upgrade to using rbac.authorization.k8s.io/v1. This has been available since Kubernetes 1.8 so is supported within all Kubernetes versions that we support.

As per the deprecation documentation, there are no significant changes in the V1 API.