llama.cpp Release b9969: Vulkan Improvements & Long Prompt Fix

Core summary

One sentence to understand this update

The latest llama.cpp release b9969 improves Vulkan performance on Adreno GPUs and fixes `llama-cli` crashing with long prompts for q4_0 quantized networks.

Impact & opportunity

What this could mean

Users running llama.cpp on Vulkan-enabled Adreno GPUs will experience better performance, while all users will benefit from increased stability with longer prompts in `llama-cli`.