Fix: Increase Vulkan detection timeout to 12 seconds

[LSXPrime]

The previous timeout of 1 second for detecting the Vulkan GPU using vulkaninfo --summary was insufficient on some systems, leading to the command timing out and the inference falling back to the CPU. This commit increases the timeout to 12 seconds to accommodate systems where vulkaninfo takes longer to complete.

This change addresses an issue where the Vulkan backend would frequently fall back to CPU inference due to the vulkaninfo command timing out before it could return the necessary information to detect the GPU. The increased timeout ensures that the command has sufficient time to complete on a wider range of systems, enabling the Vulkan backend to correctly detect and utilize the GPU for inference.

[martindevans]

Thanks for investigating and fixing this 😁