[tests] add the missing `require_torch_multi_gpu` flag (#30250)

add gpu flag

tests/models/bros/test_modeling_bros.py

@@ -17,7 +17,7 @@
 import copy
 import unittest
 
-from transformers.testing_utils import require_torch, slow, torch_device
+from transformers.testing_utils import require_torch, require_torch_multi_gpu, slow, torch_device
 from transformers.utils import is_torch_available
 
 from ...test_configuration_common import ConfigTester
@@ -344,6 +344,7 @@ class BrosModelTest(ModelTesterMixin, PipelineTesterMixin, unittest.TestCase):
         config_and_inputs = self.model_tester.prepare_config_and_inputs()
         self.model_tester.create_and_check_model(*config_and_inputs)
 
+    @require_torch_multi_gpu
     def test_multi_gpu_data_parallel_forward(self):
         super().test_multi_gpu_data_parallel_forward()