Commit
a05e3a66e55fb565a3b550d028adcdd1f3f33044
by Oliver Smithopen5gs-master: use DISTRO variable
Instead of hardcoding bullseye, use the DISTRO variable so it now
defaults to bookworm.
Related: OS#6057
Change-Id: Ia392de80ee1f0844563f08a6dc775678ef6b263f