Update Dockefile (#842)

Author: mc-nv

dockerfile/Dockerfile.triton.trt_llm_backend

@@ -145,7 +145,8 @@ RUN apt-get update -q=2 \
     && apt-get purge -y "libnvinfer*" \
     && pip3 uninstall -y tensorrt \
     && rm -rf /var/lib/apt/lists/* \
-    && pip3 install --no-cache-dir polygraphy==0.49.9 mpi4py==3.1.5
+    && pip3 install --no-cache-dir polygraphy==0.49.9 \
+    && curl -sSL https://raw.githubusercontent.com/triton-inference-server/TensorRT-LLM/refs/tags/v1.1.0/docker/common/install_mpi4py.sh | bash
 
 # Install NVRTC
 RUN [ "$(uname -m)" != "x86_64" ] && arch="sbsa" || arch="x86_64" \