mkosi: update debian commit reference

mkosi: update debian commit reference

* c004a150e7 Configure default DNS servers for upstream CI builds
* a27b1516c9 autopkgtest: set Release= in mkosi.local.conf to distinguish testing vs unstable
* dddce818b2 autopkgtest: add allow-stderr to timedated test
* 2a7b111506 Install valrinkctl zsh completion file
* 862497a139 d/t/control: add Depends: lib{systemd,udev}-dev for upstream
* cb78791b85 d/t/upstream: ensure correct ubuntu codename is used
* fe7445b94d d/t/boot-and-services: fix a couple python sytax warnings
* 2a875917cc d/t/boot-and-services: skip test_tmp_cleanup if tmp.mount is overridden
* 6fe81acbc9 Install zsh completion for run0