Bump llamacpp to b9859

[krissetto]

No description provided.

[gemini-code-assist]

Code Review

This pull request updates the LLAMA_SERVER_VERSION to b9859 in the .versions file and the Dockerfile, and bumps the llama.cpp vendor subproject commit to 4fc4ec5541b243957ae5099edb67372f8f3b550e. I have no feedback to provide.

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="Dockerfile" line_range="4-6" />
<code_context>

 ARG GO_VERSION=1.25
-ARG LLAMA_SERVER_VERSION=b9592
+ARG LLAMA_SERVER_VERSION=b9859
 ARG LLAMA_SERVER_VARIANT=cpu
-ARG LLAMA_UPSTREAM_IMAGE=ghcr.io/ggml-org/llama.cpp:server-vulkan-b9592
+ARG LLAMA_UPSTREAM_IMAGE=ghcr.io/ggml-org/llama.cpp:server-vulkan-b9859

 ARG VERSION=dev
</code_context>
<issue_to_address>
**suggestion:** Avoid duplicating the llama.cpp version string to reduce risk of future drift.

LLAMA_SERVER_VERSION and LLAMA_UPSTREAM_IMAGE both embed `b9859`. Please derive LLAMA_UPSTREAM_IMAGE from LLAMA_SERVER_VERSION (e.g., via build arg or build-time substitution) so version bumps only require a single update and can’t drift out of sync.
</issue_to_address>

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[sourcery-ai]

suggestion: Avoid duplicating the llama.cpp version string to reduce risk of future drift.

LLAMA_SERVER_VERSION and LLAMA_UPSTREAM_IMAGE both embed b9859. Please derive LLAMA_UPSTREAM_IMAGE from LLAMA_SERVER_VERSION (e.g., via build arg or build-time substitution) so version bumps only require a single update and can’t drift out of sync.