[neon-notifications] Dev Required: python-packaging - 26.0rc3

[Neon CI]

https://build.neon.kde.org/job/watcher_release_backports-noble_python-packaging-noble/168/display/redirect

#<Debian::UScan::DEHS::Package:0x0000787535e2e190 @name="python-packaging", @debian_uversion="24.2", @debian_mangled_uversion="24.2", @upstream_version="26.0rc3", @upstream_url="http://pypi.debian.net/packaging/packaging-26.0rc3.tar.gz", @status="Newer version available">