github.com/golang/protobuf/proto is deprecated

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

go.mod

@@ -28,7 +28,6 @@ require (
 	github.com/fsnotify/fsnotify v1.4.9
 	github.com/gogo/googleapis v1.4.0
 	github.com/gogo/protobuf v1.3.2
-	github.com/golang/protobuf v1.4.3
 	github.com/google/go-cmp v0.5.4
 	github.com/google/uuid v1.2.0
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
@@ -57,6 +56,7 @@ require (
 	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
 	golang.org/x/sys v0.0.0-20210426230700-d19ff857e887
 	google.golang.org/grpc v1.38.0
+	google.golang.org/protobuf v1.25.0
 	gotest.tools/v3 v3.0.3
 	k8s.io/api v0.20.6
 	k8s.io/apimachinery v0.20.6