chore(3p/sources): bump channels & overlays (2024-03-17)

In hope that iwlwifi works again on this commit, and I don't actually
have to debug it.

Includes following changes:

* users/aspen: home-manager is shuffling around pinentry options again
* users/flokli: rebase ipu6-softisp patches to Linux 6.8
                make cl/11097 a separate patch
* ops/modules: remove unused (and now broken) v4l2loopback module

Co-Authored-By: Florian Klink <flokli@flokli.de>
Change-Id: I763f1f075778f2ed8db7803f87248c9dabde4213
Reviewed-on: https://cl.tvl.fyi/c/depot/+/11174
Reviewed-by: tazjin <tazjin@tvl.su>
Reviewed-by: aspen <root@gws.fyi>
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

users/flokli/ipu6-softisp/README.md

@@ -5,7 +5,7 @@ https://copr.fedorainfracloud.org/coprs/jwrdegoede/ipu6-softisp/.
 
 It's supposed to be included in your NixOS configuration imports, and will:
 
- - Add some patches to your kernel, which should apply on 6.7.x
+ - Add some patches to your kernel, which should apply on 6.8.x
  - Add the `ipu6-camera-bins` firmware (still needed)
  - Enable some kernel config options
  - Add an udev rule so libcamera can do DMABUF things
@@ -16,6 +16,9 @@ It's supposed to be included in your NixOS configuration imports, and will:
 Please make sure you don't have any of the `hardware.ipu6` options still
 enabled, as they use the closed-source userspace stack and will conflict.
 
+Also make sure to track nixos-unstable for this. This code will get periodically
+updated to be compatible with nixos-unstable!
+
 The testing instructions from
 https://copr.fedorainfracloud.org/coprs/jwrdegoede/ipu6-softisp/ still apply.