[CI] Try introducing isort. (#3495)

vllm/model_executor/layers/ops/rand.py

@@ -1,9 +1,9 @@
+from typing import Optional, Union
+
 import torch
 import triton
 import triton.language as tl
 
-from typing import Optional, Union
-
 
 def seeded_uniform(
     *size,

vllm/model_executor/layers/ops/sample.py

@@ -1,5 +1,5 @@
 import math
-from typing import Tuple, Optional
+from typing import Optional, Tuple
 
 import torch
 import triton