Bump google.golang.org/grpc from 1.47.0 to 1.56.3 (#18)

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.47.0 to 1.56.3.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.47.0...v1.56.3)

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

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go.mod

@@ -8,10 +8,10 @@ require (
 	github.com/kubernetes-csi/csi-test/v4 v4.4.0
 	github.com/onsi/gomega v1.19.0
 	github.com/rs/zerolog v1.20.0
-	github.com/stretchr/testify v1.7.1
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/sys v0.0.0-20220209214540-3681064d5158
-	google.golang.org/grpc v1.47.0
+	github.com/stretchr/testify v1.8.3
+	golang.org/x/sync v0.1.0
+	golang.org/x/sys v0.7.0
+	google.golang.org/grpc v1.56.3
 	k8s.io/api v0.24.3
 	k8s.io/apimachinery v0.24.3
 	k8s.io/client-go v0.24.2