[Fix] adjust pip install order to keep nccl version as 2.25.1

Author: XHPlus

Dockerfile

@@ -38,9 +38,9 @@ WORKDIR /root
 COPY ./requirements.txt /lightllm/requirements.txt
 RUN pip install -r /lightllm/requirements.txt --no-cache-dir --ignore-installed --extra-index-url https://download.pytorch.org/whl/cu124
 
-RUN pip install --no-cache-dir nvidia-nccl-cu12==2.25.1  # for allreduce hang issues in multinode H100
-
 RUN pip install --no-cache-dir https://github.com/ModelTC/flash-attn-3-build/releases/download/v2.7.4.post1/flash_attn-3.0.0b1-cp39-cp39-linux_x86_64.whl
 
+RUN pip install --no-cache-dir nvidia-nccl-cu12==2.25.1  # for allreduce hang issues in multinode H100
+
 COPY . /lightllm
 RUN pip install -e /lightllm --no-cache-dir