dataset.sh & weight.sh in npusim branch not updated

[GeorgeLin200100]

Hey! I come from the amazing yonseicasl/NPUsim repo, in NPUsim repo the npusim.sh clone the npusim branch of Nebula, where dataset.sh and weight.sh not updated yet (it fails the NPUsim run). Hopefully you can bump the npusim branch for seamlessly integration of NPUsim. Best regards!

Evidence for npusim.sh clones the npusim branch of Nebula as follows:

# Build Nebula library
            # Install Nebula software framework from Github
            if [[ ! -d $nebuladir ]]; then
                echo -e "\n# Install Nebula framework from Github"
                cd $extdir; git clone --branch npusim --single-branch https://github.com/yonsei-icsl/nebula
            fi