Patch release 4.55.1:

Mostly focused around stabalizing the Mxfp4 for GPTOSS model!

Bug Fixes & Improvements

• Idefics2, Idefics3, SmolVLM – Fix tensor device issue (#39975) by @qgallouedec
• Merge conflicts – Fix merge conflicts from previous changes by @vasqu
• MXFP4 / CPU device_map – Default to dequantize when CPU is in device_map (#39993) by @MekkCyber
• GPT Big Code – Fix attention scaling (#40041) by @vasqu
• Windows compatibility – Resolve Triton version check compatibility (#39986) by @Tsumugii24 @MekkCyber
• Gemma3n model – Add missing None default values for get_placeholder_mask (#39991, #40024) by @Znerual
• Fuyu model – Fix broken image inference (#39915) by @Isotr0py
• PerceptionLM – Fix missing video inputs (#39971) by @shuminghu
• Idefics – Fix device mismatch (#39981) by @zucchini-nlp
• Triton kernels – Remove triton_kernels dependency in favor of included kernels (#39926) by @SunMarc
• GPT-OSS MXFP4 – Enable on older hardware (sm75+) (#39940) by @matthewdouglas @SunMarc
• MXFP4 quantizer – Allow CPU inference with dequantize option (#39953) by @returnL

CI & Build

• CI stability – Post-GPT-OSS fixes for green CI (#39929) by @gante @LysandreJik