[Submodule][FlashAttention] Bump to 2.7.4 (#148147)

# Summary
This makes me happy
Pull Request resolved: https://github.com/pytorch/pytorch/pull/148147
Approved by: https://github.com/Skylion007
This commit is contained in:
drisspg
2025-02-27 17:34:39 -08:00
committed by PyTorch MergeBot
parent 83ec7cdcd4
commit 3a69dee955