mkosi: update fedora commit reference

mkosi: update fedora commit reference

* 8153d9b0f9 Revert "Remove tmpfiles snippet for /home and /srv"
* a76669ee22 Remove tmpfiles snippet for /home and /srv
* b3e1d52cb4 Soft-disable tmpfiles --purge until a good use case comes up
* 4a29ab3f3b Version 256.1
* ebf352d292 disable auto-features when bootstrapping
* 1ae0516ae7 Version 256
* b32641170e Restore patch to drop varlink method call
* 421f0041b3 Version 256~rc4
* 65d9b49791 Fix typo
* c56891fb68 Drop sysusers.d/basic.conf
* 69472997b9 Renumber sources and make order more consistent