It moves to qbs/qbs
Developers need to run
git submodule sync
on existing checkouts once, to fetch the new URL

Change-Id: I9d526a0df6f4a3fad56e6998880455e003e96d9a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Jake Petroules <jake.petroules@qt.io>