Bump candle-flash-attn from be4f920 to 1febb7b

Bumps [candle-flash-attn](https://github.com/huggingface/candle) from `be4f920` to `1febb7b`.
- [Commits](huggingface/candle@be4f920...1febb7b)

---
updated-dependencies:
- dependency-name: candle-flash-attn
  dependency-version: 1febb7b43aef829712b2648b9fb3a0855ce8f066
  dependency-type: direct:production
...

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Author: dependabot[bot]