[Bugfix] Fix triton import with local TritonPlaceholder (#17446)

Signed-off-by: Mengqing Cao <cmq0113@163.com>

vllm/v1/sample/rejection_sampler.py

@@ -3,10 +3,9 @@ from typing import Optional
 
 import torch
 import torch.nn as nn
-import triton
-import triton.language as tl
 
 from vllm.logger import init_logger
+from vllm.triton_utils import tl, triton
 from vllm.v1.sample.metadata import SamplingMetadata
 from vllm.v1.sample.ops.topk_topp_sampler import apply_top_k_top_p
 from vllm.v1.spec_decode.metadata import SpecDecodeMetadata