nixpkgs/pkgs/applications/graphics/sane
Guillaume Girol f0ddf281c5 sane-backends: 1.1.1 -> 1.2.1
changelog: https://gitlab.com/sane-project/backends/-/tags/1.2.1

Tested by scanning in nixos-rebuild build-vm, which can be done by
passing your USB printer to the vm as follows:
QEMU_OPTS="-device usb-ehci,id=ehci -device usb-host,vendorid=0x1234,productid=0xabcd" result/bin/run-nixos-vm
where lsusb reports
Bus 003 Device 008: ID 1234:abcd The Printer
2023-02-12 12:00:00 +00:00
..
backends sane-backends: 1.1.1 -> 1.2.1 2023-02-12 12:00:00 +00:00
config.nix
drivers.nix
frontends.nix
xsane.nix