[VLLM][unified attention] Updating VLLM pin leads to verification issues for the upstream code

[Egor-Krivov]

Updating VLLM pin to d6953beb91da4e9c99be4c0a1304a2d24189535c leads to verification issues for the upstream triton code. The changes includes key optimization for sliding attention performance.

Need to investigate the issue

[Egor-Krivov]

To be more specific, the guilty commit is 01a583fea40571986ffe277549e5bb441d409768

vllm-project/vllm@01a583f