upgrade protoc to 3.17.3

$brew install protobuf
$ protoc --version
libprotoc 3.17.3
$ go install google.golang.org/protobuf/cmd/protoc-gen-go@v1.26
$ go install google.golang.org/grpc/cmd/protoc-gen-go-grpc@v1.1

weed/server/volume_server.go

@@ -2,6 +2,7 @@ package weed_server
 
 import (
 	"github.com/chrislusf/seaweedfs/weed/pb"
+	"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
 	"net/http"
 	"sync"
@@ -17,6 +18,7 @@ import (
 )
 
 type VolumeServer struct {
+	volume_server_pb.UnimplementedVolumeServerServer
 	inFlightUploadDataSize        int64
 	inFlightDownloadDataSize      int64
 	concurrentUploadLimit         int64