[neon-notifications] Dev Required: sip6 - 6.12.0

[Neon CI]

https://build.neon.kde.org/job/watcher_release_forks_sip6/294/display/redirect

#<Debian::UScan::DEHS::Package:0x000072cb03797958 @name="sip6", @debian_uversion="6.10.0", @debian_mangled_uversion="6.10.0", @upstream_version="6.12.0", @upstream_url="https://github.com/Python-SIP/sip/archive/refs/tags/6.12.0.tar.gz", @status="Newer version available">