[CI] Upgrade trasnformers version (#6307)

Upgrade transformers to >=4.56.4

- vLLM version: v0.14.1
- vLLM main:
dc917cceb8

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

tests/e2e/multicard/2-cards/test_qwen3_moe.py

@@ -22,7 +22,6 @@ from unittest.mock import patch
 
 import openai
 import pytest
-from modelscope import snapshot_download  # type: ignore
 from vllm.utils.network_utils import get_open_port
 
 from tests.e2e.conftest import RemoteOpenAIServer, VllmRunner
@@ -50,7 +49,7 @@ def test_qwen3_moe_w8a8_distributed_tp2():
     ]
     max_tokens = 5
     with VllmRunner(
-            snapshot_download("vllm-ascend/Qwen3-30B-A3B-W8A8"),
+            "vllm-ascend/Qwen3-30B-A3B-W8A8",
             max_model_len=8192,
             tensor_parallel_size=2,
             cudagraph_capture_sizes=[1, 2, 4, 8],