unsloth: pin ggml-org#27941 so the qwen4exp fixes reach the nightlies - #148

unslothai/llama.cpp#91 is closed; the nightly will keep merging its pinned commit (a no-op once the base tag contains it), so drop the entry when you no longer want that code

unslothai/llama.cpp#107 is closed; the nightly will keep merging its pinned commit (a no-op once the base tag contains it), so drop the entry when you no longer want that code