releng: Add orbit dependencies to update site

releng: Add orbit dependencies to update site

So that we have all dependencies that we need for the simrel build.
The Orbit update site is not used in this build so we need to provide
our own dependencies.

Change-Id: I255964df42b02f68612f474a725b0a5778c65b44
Signed-off-by: Marc-Andre Laperle <marc-andre.laperle@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/78898
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Hudson CI