Bump google.golang.org/grpc from 1.13.0 to 1.56.3

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.13.0 to 1.56.3.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.13.0...v1.56.3)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -6,19 +6,13 @@ require (
 	github.com/container-storage-interface/spec v1.1.0
 	github.com/coreos/go-systemd/v22 v22.5.0
 	github.com/godbus/dbus/v5 v5.0.4
-	github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b
-	github.com/golang/protobuf v1.1.0 // indirect
+	github.com/golang/glog v1.1.0
 	github.com/kubernetes-csi/csi-lib-utils v0.6.1 // indirect
 	github.com/kubernetes-csi/drivers v1.0.2
 	github.com/minio/minio-go/v7 v7.0.5
 	github.com/mitchellh/go-ps v0.0.0-20170309133038-4fdf99ab2936
-	github.com/spf13/afero v1.2.1 // indirect
-	golang.org/x/crypto v0.0.0-20200820211705-5c72a883971a // indirect
-	golang.org/x/net v0.0.0-20200707034311-ab3426394381
-	golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6 // indirect
-	golang.org/x/sys v0.0.0-20200922070232-aee5d888a860 // indirect
-	google.golang.org/genproto v0.0.0-20180716172848-2731d4fa720b // indirect
-	google.golang.org/grpc v1.13.0
+	golang.org/x/net v0.9.0
+	google.golang.org/grpc v1.56.3
 	k8s.io/apimachinery v0.0.0-20180714051327-705cfa51a97f // indirect
 	k8s.io/klog v0.2.0 // indirect
 	k8s.io/kubernetes v1.13.4