fix a typo

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

docker/ci/dockerfiles/current/build.centos7.opensearch.x64.arm64.dockerfile

@@ -96,7 +96,7 @@ RUN pip3 install cmake==3.23.3
 # The setup part is partially based on Austin Dewey's article:
 # https://austindewey.com/2019/03/26/enabling-software-collections-binaries-on-a-docker-image/
 RUN yum install -y centos-release-scl && yum install -y devtoolset-7 && yum clean all && \
-    echo "source scl_source enable devtoolset-7" > /etc/profile.d/scl_devtoolset8.sh
+    echo "source scl_source enable devtoolset-7" > /etc/profile.d/scl_devtoolset7.sh
 COPY --chown=0:0 config/scl_setup_devtoolset7 /usr/local/bin/scl_setup
 ENV BASH_ENV="/usr/local/bin/scl_setup"
 ENV ENV="/usr/local/bin/scl_setup"