Update CSI Proxy to v1.2.1-gke.2

Author: mauriciopoppe

cluster/gce/config-common.sh

@@ -158,7 +158,7 @@ export WINDOWS_INFRA_CONTAINER="registry.k8s.io/pause:3.10"
 # Storage Path for csi-proxy. csi-proxy only needs to be installed for Windows.
 export CSI_PROXY_STORAGE_PATH="https://storage.googleapis.com/gke-release/csi-proxy"
 # Version for csi-proxy
-export CSI_PROXY_VERSION="${CSI_PROXY_VERSION:-v1.1.1-gke.0}"
+export CSI_PROXY_VERSION="${CSI_PROXY_VERSION:-v1.2.1-gke.2}"
 # csi-proxy additional flags, there are additional flags that cannot be unset in k8s-node-setup.psm1
 export CSI_PROXY_FLAGS="${CSI_PROXY_FLAGS:-}"
 # Storage path for auth-provider-gcp binaries