[xpu] [bugfix] upgrade to latest oneccl in dockerfile (#31522)

Signed-off-by: roger feng <roger.feng@intel.com>

docker/Dockerfile.xpu

@@ -28,10 +28,14 @@ RUN update-alternatives --install /usr/bin/python python /usr/bin/python3.12 1
 RUN apt install -y libze1 libze-dev libze-intel-gpu1 intel-opencl-icd libze-intel-gpu-raytracing intel-ocloc
 
 # This oneccl contains the BMG support which is not the case for default version of oneapi 2025.2.
-RUN wget https://github.com/uxlfoundation/oneCCL/releases/download/2021.15.6/intel-oneccl-2021.15.6.9_offline.sh
-RUN bash intel-oneccl-2021.15.6.9_offline.sh -a --silent --eula accept && \
+ARG ONECCL_INSTALLER="intel-oneccl-2021.15.7.6_offline.sh"
+RUN wget "https://github.com/uxlfoundation/oneCCL/releases/download/2021.15.7/${ONECCL_INSTALLER}" && \
+    bash "${ONECCL_INSTALLER}" -a --silent --eula accept && \
+    rm "${ONECCL_INSTALLER}" && \
     echo "source /opt/intel/oneapi/setvars.sh --force" >> /root/.bashrc && \
     echo "source /opt/intel/oneapi/ccl/2021.15/env/vars.sh --force" >> /root/.bashrc
+RUN rm -f /opt/intel/oneapi/ccl/latest && \
+    ln -s /opt/intel/oneapi/ccl/2021.15 /opt/intel/oneapi/ccl/latest
 
 SHELL ["bash", "-c"]
 CMD ["bash", "-c", "source /root/.bashrc && exec bash"]