rel_upgrade_root: Import syslog

[Amadeus-22]

on_removals_finished (the last step of the release upgrade, which runs update-grub) logs a failure with syslog.syslog(), but rel_upgrade_root.py never imports syslog.

So if update-grub is missing or raises (subprocess.run raises FileNotFoundError when the command does not exist), the except block itself fails with NameError: name 'syslog' is not defined. The exception is raised inside the aptkit callback, so Gtk.main_quit() and sys.exit(0) are never reached and the root upgrade process stays alive in the GTK main loop.

The fix is the missing import. No other module in the repository imports syslog either, and this is the only use.

To check it without running a real release upgrade, I executed the real Upgrader.on_removals_finished in a harness that stubs GTK and makes subprocess.run raise FileNotFoundError:

• without the import: the handler raises NameError: name 'syslog' is not defined, and Gtk.main_quit() is never called
• with the import: Gtk.main_quit() is called and the process exits with code 0

I did not run a real release upgrade.

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