GIT_SILENT Update Appstream for new release

(cherry picked from commit cf99f2af)
2 jobs for master in 19 minutes and 19 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #55286
linux kf5-qt5 qt5.12

00:19:19

15.0%
failed #55188
linux kf5-qt5 qt5.12

00:02:27