[WIP][Attention][FA3] Update FA3 to include new swizzle optimization

[LucasWilkinson]

WIP; vLLM side of vllm-project/flash-attention#82 merge that first

This PR is just marked ready to validate CI and building before merging vllm-project/flash-attention#82

[gemini-code-assist]

Code Review

This pull request updates the flash-attention dependency to a new commit hash, likely to incorporate the 'FA3 swizzle optimization' mentioned in the PR title. While pinning to a commit is good for reproducibility, using a commit hash that is not part of a tag or a long-lived branch can pose a risk for future builds and maintenance. I've added a comment suggesting the use of a git tag for better long-term stability.

[gemini-code-assist]

Pinning dependencies to a specific commit hash is good for reproducibility. However, for long-term maintenance and release builds, it's better to use a git tag. Commit hashes that are not part of a branch or tag can be garbage collected by git, or become hard to track. Since this is a work-in-progress, it's acceptable for now, but it would be best to create a tag in the vllm-project/flash-attention repository for this commit before this PR is merged.

[github-actions]

This pull request has been automatically marked as stale because it has not had any activity within 90 days. It will be automatically closed if no further activity occurs within 30 days. Leave a comment if you feel this pull request should remain open. Thank you!