mkosi: update fedora commit reference to
7de88c66bdc26920db570e67ef74e579f8461d9c
*
7de88c66bd Do not mark symlinks as %ghost
*
92c16c1dab Let systemd-{sysusers,shared} conflict with older systemd
*
ed6b885327 Version 257.6
*
5a53eac13c Package pcrlock files together with systemd-pcrlock
*
2192e86112 Move mount.ddi symlinks to -container subpackage
*
451184cbea Revert "Disable freezing of user sessions"
*
f6af46db12 Backport adb/fastboot udev rules (BZ#
2356537)
*
f6b814cc0f Backport CI fix
*
d304477023 Version 257.5