fix: update ggml to fix INT8 convrot backend fallback - #2069
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Summary
Update ggml to preserve INT8 ConvRot packed-input metadata across backend copies. This prevents CPU matmul assertions when activation quantization runs on CUDA and matmul falls back to CPU, as reported on V100.
The fix also unifies packed-input validation across CPU, CUDA, and Vulkan.
Related Issue / Discussion
Fix #2068.
Additional Information
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