- Add conflict in appstream-qt6-devel with
libAppStreamQt-devel < 1.0. This is required to fix a file
conflict in SLE with the old libAppStreamQt-devel package.

This fixes the following file conflict:

found conflict of appstream-qt6-devel-1.0.2-150600.1.1.x86_64 with libAppStreamQt-devel-0.15.6-150500.1.1.x86_64
/usr/lib64/libAppStreamQt.so
/usr/include/AppStreamQt/appstreamqt_export.h
/usr/include/AppStreamQt/bundle.h
/usr/include/AppStreamQt/category.h
/usr/include/AppStreamQt/component.h
/usr/include/AppStreamQt/contentrating.h
/usr/include/AppStreamQt/icon.h
/usr/include/AppStreamQt/image.h
/usr/include/AppStreamQt/launchable.h
/usr/include/AppStreamQt/metadata.h
/usr/include/AppStreamQt/pool.h
/usr/include/AppStreamQt/provided.h
/usr/include/AppStreamQt/relation.h
/usr/include/AppStreamQt/release.h
/usr/include/AppStreamQt/screenshot.h
/usr/include/AppStreamQt/spdx.h
/usr/include/AppStreamQt/suggested.h
/usr/include/AppStreamQt/translation.h
/usr/include/AppStreamQt/utils.h
/usr/include/AppStreamQt/version.h
/usr/include/AppStreamQt/video.h
/usr/lib64/cmake/AppStreamQt/AppStreamQtConfig.cmake
/usr/lib64/cmake/AppStreamQt/AppStreamQtConfigVersion.cmake