Changes

also fix /bin/sync diversion for bullseye

When doing this in bookworm, we're in the unmerged case. Unfortunately,
I added --no-rename, so now ln -sv sees that /bin/sync exists and fails.

The --no-rename was added, because renaming is ambiguous on merged-/usr,
but we're in the unmerged case here, so use --rename.

Closes: #1068312
Fixes: 1b9a3843964b ("also fix /bin/sync diversion for bookworm")