This package is part of the "non-free-firmware" debian component. You need to enable that in your apt sources.list.
See https://www.reddit.com/r/debian/comments/11012k4/tip_all_nonfree_firmware_packages_have_moved_to/
PBS has a new, custom round robin database implementation using higher resolutions. We may switch to this new implementation in the next major PVE release, but this is not yet decided...