Add no-shuffle tag to gen_defaults_test.dart (#142717)

For flutter/flutter#142716

Author: zanderso

dev/tools/gen_defaults/test/gen_defaults_test.dart

@@ -2,6 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// TODO(davidmartos96): Remove this tag once this test's state leaks/test
+// dependencies have been fixed.
+// https://github.com/flutter/flutter/issues/142716
+// Fails with "flutter test --test-randomize-ordering-seed=20240201"
+@Tags(<String>['no-shuffle'])
+library;
+
 import 'dart:async';
 import 'dart:io';