systemd v253 changelog/NEWS:
https://github.com/systemd/systemd/blob/v253/NEWS
NixOS changes:
0007-hostnamed-localed-timedated-disable-methods-that-cha.patch was
dropped, because systemd gained support to handle read-only /etc.
*-add-rootprefix-to-lookup-dir-paths.patch required some updates too,
as src/basic/def.h moved to src/basic/constants.h.
systemd/systemd#25771 switched p11kit to become
dlopen()'ed, so we need to patch that path.
added a note to the 23.05 release notes to recommend `nixos-rebuild boot`
Co-authored-by: Florian Klink <flokli@flokli.de>
