depend-cleanup: fix after 99b2ab71c5b6

After commit 99b2ab71c5b6 was merged, the stable/13 version of
depend-cleanup gives an error "run: not found". This is because the "dry
run" functionality from commit 1ec7cb1b5d18 was never merged.

Remove the "run" invocation to make the script correctly again, as
merging commit 1ec7cb1b5d18 results in many conflicts.

Direct commit to stable/13, since this does not apply to other branches.

Reported by: des
Fixes: 99b2ab71c5b6