regen with never protoc-gen-go

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

server/grpc/proto/test.pb.go

@@ -7,7 +7,6 @@
 package helloworld
 
 import (
-	proto "github.com/golang/protobuf/proto"
 	_ "google.golang.org/genproto/googleapis/api/annotations"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
@@ -22,10 +21,6 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
-// This is a compile-time assertion that a sufficiently up-to-date version
-// of the legacy proto package is being used.
-const _ = proto.ProtoPackageIsVersion4
-
 type Request struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache