debian12更新源

deb http://mirrors.ustc.edu.cn/debian bookworm main contrib non-free non-free-firmware deb-src http://mirrors.ustc.edu.cn/debian bookworm main contrib non-free non-free-firmware deb http://mirrors.ustc.edu.cn/debian bookworm-updates main contrib non-free non-free-firmware deb-src http://mirrors.ustc.edu.cn/debian bookworm-updates main contrib non-free non-free-firmware