add cache_position to mask_kwargs in modeling_step3p7.py

In transformers version 5.0.0, the create_causal_mask function requires the cache_position argument.

modeling_step3p7.py

@@ -974,6 +974,7 @@ class Step3p7TextModel(Step3p7TextPreTrainedModel, GenerationMixin):
             mask_kwargs = {
                 "config": self.config,
                 "attention_mask": attention_mask,
+                "cache_position": cache_position,
                 "past_key_values": past_key_values,
                 "position_ids": position_ids,
             }