ci: switch to remote git refs for dependent projects

The project YML files are to be removed from libvirt-ci.git, so
this updates the manifest to use remote git refs.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

ci/manifest.yml

 projects:
   - libvirt-dbus
-  - libvirt+dist
-  - libvirt-glib+dist
+  - https://gitlab.com/libvirt/libvirt/-/raw/master/ci/lcitool/projects/libvirt+dist.yml
+  - https://gitlab.com/libvirt/libvirt-glib/-/raw/master/ci/lcitool/projects/libvirt-glib+dist.yml
 
 gitlab:
   namespace: libvirt