Add git submodule update to build_backend.py#3190

aleozlx merged 2 commits into

flashinfer-ai:mainflashinfer-ai/flashinfer:mainfrom

kahyunnam:knam/cccl-submodules-update-fixkahyunnam/flashinfer:knam/cccl-submodules-update-fixCopy head branch name to clipboard