ignore avoid_print in pigeon project runner

packages/pigeon/tool/shared/native_project_runners.dart

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// ignore_for_file: avoid_print
+
 import 'dart:io';
 
 import 'package:path/path.dart' as path;