jenkins-common.sh: open5gs-latest does not require debian-bullseye-build
We're not *building* anything for the open5gs-latest, but simply
downloading and installing DEBs from Sukchan's opensuse.org repo.
Change-Id: Iec7ccab28c37d274a731e08a2f893ec0514c1068
Fixes: 62ac21133a828bab849c072f27664102790fcb91
