fix JambaModelIntegrationTest (#8965)

Author: JunnYu

tests/transformers/jamba/test_modeling.py

@@ -595,6 +595,7 @@ def test_from_hf_hub(self):
         self.assertTrue(model.config.vocab_size == 65536)
 
 
+@slow
 class JambaModelIntegrationTest(unittest.TestCase):
     model = None
     tokenizer = None