FOSS activity in December 2023

I made a merge request to get rid of the manual split between old and current changelogs in the Debian linux source package. As there wasn't agreement on this I've since closed it.
I updated the linux (4.19) package for buster to upstream version 4.19.302, but didn't upload it.
I reported a bug in libnfsidmap packages involving aliased file locations that can (in principle) result in file loss on upgrade.