[neon-notifications] Releasing: kactivities-kf5 - 5.87.0

[Neon CI]

https://build.neon.kde.org/job/watcher_release_kde_kactivities/10/display/redirect

#<Debian::UScan::DEHS::Package:0x0000564f59134030 @name="kactivities-kf5", @debian_uversion="5.86.0", @debian_mangled_uversion="5.86.0", @upstream_version="5.87.0", @upstream_url="https://download.kde.internal.neon.kde.org/stable/frameworks/5.87/kactivities-5.87.0.tar.xz", @status="Newer version available">