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Bullseye is not an officially supported distribution for ROS Noetic, this is why there are no debian packages available for it. More details can be found on similar questions: https://answers.ros.org/question/265252/what-ros-distributions-is-ros-debian-compatible-with/ The reference to know which distribution / architectures are supported by a given ROS Distribution is REP-003.
The approach I usually favor for RaspberryPis is to install an Ubuntu 64bits (20.04 Focal for ROS Noetic) on them and install ROS following the official installation instructions.