[neon-notifications] Dev Required: zxing-cpp - 1.4.0

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-focal_zxing-cpp/135/display/redirect

#<Debian::UScan::DEHS::Package:0x000055adbf150618 @name="zxing-cpp", @debian_uversion="1.2.0", @debian_mangled_uversion="1.2.0", @upstream_version="1.4.0", @upstream_url="https://github.com/zxing-cpp/zxing-cpp/archive/refs/tags/v1.4.0.tar.gz", @status="Newer version available">