The spec file contains an outdated URL https://projects.kde.org/kblackbox
which redirects to https://quickgit.kde.org/ instead of to the particular repo
for this project or a website dedicated to it.

Please replace the URL with something more specific. Our automated test suite
checks whether URL values are correct and accessing https://quickgit.kde.org/
is a very expensive operation for KDE maintainers, who complained about this
already:
https://mail.kde.org/pipermail/kde-distro-packagers/2016-March/000142.html
See https://phab.qadevel.cloud.fedoraproject.org/T760 for more detail
about this, if interested.

Please note that this a mass-reported bug. Bug 1325128 serves a tracker bug
for all affected packages in Fedora.