bug#73428: update elogind to 255

[Julian Flake]

Hi,

...or, if you need additional channels or can't get this to 
work, you
can commit your changes, replace the guix channel URL with
"file:///home/your/guix", guix pull
--{allow-downgrades,disable-authentication}, and reconfigure as 
you
would otherwise.

that's actually exactly, what I started this morning. Building all 
the packages takes a lot of time (and is still running), of 
course.