Change the multi-arch builders reboot window to friday

[jbtrystram]

We've had the bump-lockfiles jobs fails because of the multi-arch builders are rebooting on monday morning [1].

Let's change the update window to sunday, and make sure the mechanical builds aren't running on sundays since no one is monitoring the pipeline anyway.

[1]

fedora-coreos-pipeline/multi-arch-builders/builder-common.bu

Lines 75 to 83 in 67c5f9f

	- path: /etc/zincati/config.d/51-updates-early-monday-morning.toml
	contents:
	inline: |
	[updates]
	strategy = "periodic"
	[[updates.periodic.window]]
	days = [ "Mon" ]
	start_time = "07:00"
	length_minutes = 60