Add Fields type alias to log package

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

runtime/v2/shim/shim.go

@@ -315,7 +315,7 @@ func run(ctx context.Context, manager Manager, initFunc Init, name string, confi
 		if debugFlag {
 			logrus.SetLevel(logrus.DebugLevel)
 		}
-		logger := log.G(ctx).WithFields(logrus.Fields{
+		logger := log.G(ctx).WithFields(log.Fields{
 			"pid":       os.Getpid(),
 			"namespace": namespaceFlag,
 		})
@@ -494,7 +494,7 @@ func serve(ctx context.Context, server *ttrpc.Server, signals chan os.Signal, sh
 			log.G(ctx).WithError(err).Fatal("containerd-shim: ttrpc server failure")
 		}
 	}()
-	logger := log.G(ctx).WithFields(logrus.Fields{
+	logger := log.G(ctx).WithFields(log.Fields{
 		"pid":       os.Getpid(),
 		"path":      path,
 		"namespace": namespaceFlag,