[Tails-l10n] Release schedule for Tails 5.20

Hi,

Tails 5.20 is scheduled for November 28.

anonym will be the RM for Tails 5.20

The current plan is:
- Monday, Nov 27: build images, start testing
- Tuesday, Nov 28: releasing

@testers, please let the RM know how much time you'll have for manual QA
from Monday 17:00 to Tuesday 11:00 (Europe/Berlin)

Cheers,
--
intrigeri