mkosi: update fedora commit reference

mkosi: update fedora commit reference

* fd36e4c562 Rebuilt for the bin-sbin merge (2nd attempt)
* cddeca136f Rebuilt for the bin-sbin merge (2nd attempt)
* 20cc578e59 Enable signing systemd-boot on OBS builds
* b1bd57ecce Revert use of PrivateTmp=disconnected
* 30f50b1870 Drop patch numbers
* 1814bfe794 remove STI test
* 3a9c32b8a9 Version 257.2
* 4df2711a9f Add bcond for OBS-specific quirks
* e570cd53df spec: drop trailing whitespace
* c7379c9460 Replace 'udevadm hwdb' with systemd-hwdb
* 3386f5d704 Rename source .abignore file
* fd860fd12d Drop a build dependency on a linter package: pytest-flakes
* 133ae30e33 Drop patches based on %upstream macro instead of patch number
* e157552c6c Always build in release mode
* fc47a92e4a Re-enable upstream behaviour of systemd-tmpfiles --purge
* 62abb21906 Version 257.1
* 35e6814ef4 Add patch for test-time-util
* bd8339bf00 sysusers: support new ! line flag for creating fully locked accounts
* c2f5f4a68a Version 257
* 31aaef8e17 Enable slow tests during build