Update modeling_cogvlm.py

Update of modeling_cogvlm.py for Transformers newer version (copy of the similar commit in THUDM/cogvlm2-llama3-chat-19B)

modeling_cogvlm.py

@@ -5,6 +5,7 @@ from typing import TYPE_CHECKING, Optional, Tuple, List, Union, Literal, Dict, A
 
 import math
 import torch
+import transformers
 from torch import nn
 from torch.nn import CrossEntropyLoss
 from torchvision import transforms