Update social contract flyers to v1.2

[Agathe Porte]

Hello debian-flyers-devel list,

(please keep me in Cc, not subscribed)

I have opened a merge request to update the SC flyers to v1.2 that
includes update about non-free-firmware. You can find the code here:
https://salsa.debian.org/debian/debian-flyers/-/merge_requests/18

I send an email to this list because there was no feedback on the MR
so far.

Best regards,

Agathe.