[CI] Bug: Fix triton import issue

[yewentao256]

Purpose

Pre-commit fails, complaining

❌ Forbidden direct `import triton` detected. ➤ Use `from vllm.triton_utils import triton` instead.

❌ vllm/v1/worker/gpu/block_table.py:6: import triton
❌ vllm/v1/worker/gpu/block_table.py:7: import triton.language as tl
❌ vllm/v1/worker/gpu/input_batch.py:10: import triton
❌ vllm/v1/worker/gpu/input_batch.py:11: import triton.language as tl
❌ vllm/v1/worker/gpu/sampler.py:6: import triton
❌ vllm/v1/worker/gpu/sampler.py:7: import triton.language as tl

This PR fixes the issue

[gemini-code-assist]

Code Review

This pull request resolves a CI failure by refactoring how the triton library is imported. The changes replace direct imports with a centralized import from vllm.triton_utils in block_table.py, input_batch.py, and sampler.py. This is a good practice that correctly fixes the reported issue. The changes are sound and I have no further suggestions.