Fix TypeError in _pad method by adding missing padding_side field

The similar issue has been fixed in THUDM/LongWriter-glm4-9b and glm-4v, but it still exists here.

tokenization_chatglm.py

@@ -266,6 +266,7 @@ class ChatGLM4Tokenizer(PreTrainedTokenizer):
             padding_strategy: PaddingStrategy = PaddingStrategy.DO_NOT_PAD,
             pad_to_multiple_of: Optional[int] = None,
             return_attention_mask: Optional[bool] = None,
+            padding_side: Optional[str] = None,
     ) -> dict:
         """
         Pad encoded inputs (on left/right and up to predefined length or max length in the batch)