[CI] Try introducing isort. (#3495)

vllm/transformers_utils/configs/__init__.py

@@ -1,10 +1,10 @@
 from vllm.transformers_utils.configs.chatglm import ChatGLMConfig
-from vllm.transformers_utils.configs.mpt import MPTConfig
 # RWConfig is for the original tiiuae/falcon-40b(-instruct) and
 # tiiuae/falcon-7b(-instruct) models. Newer Falcon models will use the
 # `FalconConfig` class from the official HuggingFace transformers library.
 from vllm.transformers_utils.configs.falcon import RWConfig
 from vllm.transformers_utils.configs.jais import JAISConfig
+from vllm.transformers_utils.configs.mpt import MPTConfig
 
 __all__ = [
     "ChatGLMConfig",