Patch release 4.55.2!

only affects FA2 generations!

😢 Well sorry everyone, sometimes shit can happen... 4.55.1 was broken because of 🥁 git merge conflict. I cherry-picked https://github.com/huggingface/transformers/pull/40002 without having https://github.com/huggingface/transformers/pull/40029 , thus from ..modeling_flash_attention_utils import prepare_fa_kwargs_from_position_ids is missing, and since this is a slow test, nothing caught it.

Will work to remediate and write the post-mortem when yanking the release.