Patch release v4.56.1

This patch most notably fixes an issue with the new dtype argument (replacing torch_dtype) in pipelines!

Bug Fixes & Improvements

• Fix broken Llama4 accuracy in MoE part (#40609)
• fix pipeline dtype (#40638)
• Fix self.dropout_p is not defined for SamAttention/Sam2Attention (#40667)
• Fix backward compatibility with accelerate in Trainer (#40668)
• fix broken offline mode when loading tokenizer from hub (#40669)
• [Glm4.5V] fix vLLM support (#40696)