fix(docker): replace llama-cpp-python extra index with pinned cp312 linux wheel

Dockerfile

@@ -16,9 +16,8 @@ COPY ./requirements.txt /app/requirements.txt
 RUN pip install --upgrade pip
 
 # Install llama-cpp-python from pre-built wheel
-RUN pip install llama-cpp-python \
-    --prefer-binary  \
-    --extra-index-url https://abetlen.github.io/llama-cpp-python/whl/cpu
+RUN pip install \
+    https://github.com/abetlen/llama-cpp-python/releases/download/v0.3.2/llama_cpp_python-0.3.2-cp312-cp312-linux_x86_64.whl
 
 # Install other requirements
 RUN pip install --no-cache-dir -r requirements.txt