fix for 'DynamicCache' object has no attribute 'get_max_length'

modeling_emu3.py

@@ -1284,7 +1284,7 @@ class Emu3ForCausalLM(Emu3PreTrainedModel):
             if isinstance(past_key_values, Cache):
                 cache_length = past_key_values.get_seq_length()
                 past_length = past_key_values.seen_tokens
-                max_cache_length = past_key_values.get_max_length()
+                max_cache_length = past_key_values.get_max_cache_shape()
             else:
                 cache_length = past_length = past_key_values[0][0].shape[2]
                 max_cache_length = None