fix: update nixl veriosn to 0.4.1 (fab120d)

Author: biswapanda

container/Dockerfile.vllm

@@ -79,7 +79,7 @@ RUN apt-get update -y && \
     rm -rf /var/lib/apt/lists/*
 
 ARG NIXL_UCX_REF=v1.19.x
-ARG NIXL_REF=3c47a48955e6f96bd5d4fb43a9d80bb64722f8e4
+ARG NIXL_REF=fab120d8486ede919862033b8a6bfec81ef8f568
 
 ENV NIXL_SRC_DIR=/opt/nixl
 ENV NIXL_PREFIX=/opt/nvidia/nvda_nixl