chore(3p/sources): Bump channels & overlays r/6361

* //3p/sources: switch stable channel from 21.11 (!) to 23.05

* //users: adapt to emacsUnstable to emacs-unstable rename

* //users/grfn: use default Linux kernel version everywhere,
  as 5.15 has broken in this version of nixos-unstable.

* //3p/cgit: adapt to git 2.41.0

  The committed changes are the same as the [patch1] I've submitted
  to cgit-pink which is in turn based on Christian Hesse's [patch2].

patch1: https://causal.agency/list/thread/20230624144033.802270-1-sternenseemann%40systemli.org.html#20230624144033.802270-2-sternenseemann@systemli.org>
patch2: https://lists.zx2c4.com/pipermail/cgit/2023-June/004843.html

Co-authored-by: Christian Hesse <mail@eworm.de>

Change-Id: I549a62e7c85c66d772edda997819a40f2d5835d7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8855
Autosubmit: sterni <sternenseemann@systemli.org>
Reviewed-by: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: grfn <grfn@gws.fyi>

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