[neon-notifications] Dev Required: pyqt5 - 5.15.6

[Neon CI]

https://build.neon.kde.org/job/watcher_release_forks_pyqt5/47/display/redirect

#<Debian::UScan::DEHS::Package:0x0000565411548678 @name="pyqt5", @debian_uversion="5.15.4+dfsg", @debian_mangled_uversion="5.15.4", @upstream_version="5.15.6", @upstream_url="https://pypi.debian.net/PyQt5/PyQt5-5.15.6.tar.gz", @status="Newer version available">