Do not use /tmp for downloaded files
Do not use /tmp for downloaded files

The files are signed but downloading into user-cachedir is probably safer.

vathpela/fwupd,fwupd/fwupd,fwupd/fwupd,superm1/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,hughsie/fwupd,fwupd/fwupd,vathpela/fwupd,fwupd/fwupd,superm1/fwupd,vathpela/fwupd,vathpela/fwupd,superm1/fwupd