Android 13 system image was still being downloaded and an emulator
created for it while it's not being used in CI, so it's just adds
unnecessary load to provisioning.
Pick-to: 6.7
Change-Id: Ie33c82fd578dcfe68a77426c8e5c0cf047938833
Reviewed-by: Heikki Halmet <heikki.halmet@qt.io>