fix: import Unpack from processing_utils

Signed-off-by: xuebi <xuebi@minimaxi.com>

modeling_minimax_m2.py

@@ -21,7 +21,7 @@
 
 
 from collections.abc import Callable
-from typing import Optional, Union, Unpack
+from typing import Optional, Union
 
 import torch
 from torch import nn
@@ -41,6 +41,7 @@ from transformers.modeling_layers import (
 from transformers.modeling_outputs import MoeCausalLMOutputWithPast, MoeModelOutputWithPast
 from transformers.modeling_rope_utils import ROPE_INIT_FUNCTIONS, dynamic_rope_update
 from transformers.modeling_utils import ALL_ATTENTION_FUNCTIONS, PreTrainedModel
+from ...processing_utils import Unpack
 from transformers.utils import TransformersKwargs, auto_docstring, can_return_tuple
 from transformers.utils.deprecation import deprecate_kwarg
 from transformers.utils.generic import OutputRecorder, check_model_inputs