packagekit: Fix QA warnings

WARNING: Failed to fetch URL http://www.packagekit.org/releases/PackageKit-0.5.6.tar.gz;name=archive

, attempting MIRRORS if available
WARNING: QA Issue: packagekit rdepends on libgudev, but it isn't a build dependency? [build-deps]
WARNING: QA Issue: packagekit requires /bin/bash, but no providers in its RDEPENDS [file-rdeps]

packagekit.org is no longer responding, changed SRC_URI

Signed-off-by: Armin Kuster <akuster808@gmail.com>