I was preparing a "no-change" reupload of rust-nitrocli, so it would no longer
be built against the obsolete rust-rand-os package (for which I plan to file
a removal request). Since I prepared this with debcargo, it picked up an increase
in debcargos default debheper compat level from 11 to 12. This resulted in a build
failure.

I have set the debhelper compat level for the package back to 11 for now, but
I feel this is something that should be documented in a bug report.