mkosi: update debian commit reference to 56e0eed69a4782eb8e110650d93daebcf1ece49a

mkosi: update debian commit reference to 56e0eed69a4782eb8e110650d93daebcf1ece49a

* 56e0eed69a Update changelog for 260~rc2-1 release
* 36e6a6d247 Install new files
* 692d0ffde5 Install new files for upstream build
* 04e77a9300 Enable getty@ via packaging scriptlets, not static anymore
* 65e7898ab5 Remove build-depend on rsync, meson is new enough
* 1ab5e82a93 Update changelog for 260~rc1-2 release
* 17a8004c53 sd-boot-efi: do not pick up hwids, they are shipped by sd-ukify
* b620f379b3 Update changelog for 260~rc1-1 release
* 8eb95fc404 Drop unused Lintian overrides
* 82a111e7ef Update symbols file for v260~rc1
* 9cb8e0457b Disable remaining deprecated sysv interfaces
* 100d97ba82 Install new files for v260~rc1
* b8e9e50f4d initramfs-tools: copy udev link files from /usr/local/lib/systemd/network too