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1b064e19 - docs: Fix llama.cpp GPU Installation in llamacpp.ipynb (Deprecated Env Variable) (#29659)

docs: Fix llama.cpp GPU Installation in llamacpp.ipynb (Deprecated Env Variable) (#29659) - **Description:** The llamacpp.ipynb notebook used a deprecated environment variable, LLAMA_CUBLAS, for llama.cpp installation with GPU support. This commit updates the notebook to use the correct GGML_CUDA variable, fixing the installation error. - **Issue:** none - **Dependencies:** none