Fix API diff error (#51400)

paddle/scripts/paddle_build.sh

@@ -3441,7 +3441,6 @@ function build_pr_and_develop() {
     mkdir ${PADDLE_ROOT}/build/pr_whl && cp ${PADDLE_ROOT}/build/python/dist/*.whl ${PADDLE_ROOT}/build/pr_whl
     rm -f ${PADDLE_ROOT}/build/python/dist/*.whl && rm -f ${PADDLE_ROOT}/build/python/build/.timestamp
 
-    git fetch upstream develop
     git checkout develop
     dev_commit=`git log -1|head -1|awk '{print $2}'`
     dev_url="https://xly-devops.bj.bcebos.com/PR/build_whl/0/${dev_commit}/paddlepaddle_gpu-0.0.0-cp37-cp37m-linux_x86_64.whl"