chore: bump llama.cpp verrsion for macOS and Windows

[doringeman]

./dmr serve

$ ./dmr status
Docker Model Runner is running

BACKEND    STATUS         DETAILS
llama.cpp  Running        llama.cpp b9879-metal (sha256:b70706f473b4043ca3e0c32704a7fda3412b83bceef0564684187b8011230de8) 72874f5
diffusers  Not Installed
mlx        Not Installed  package not installed
sglang     Not Installed  only supported on Linux
vllm       Not Installed

[gemini-code-assist]

Code Review

This pull request updates the pinned llama.cpp server version in pkg/inference/backends/llamacpp/download.go from v0.0.34 to b9879. No review comments were provided, and there is no feedback to offer on this change.

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[sourcery-ai]

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