git: 9530c11c3570..c28d35783173 - vendor/tzdata - vendor branch updated

From: Philip Paeps <philip_at_FreeBSD.org>
Date: Mon, 18 Oct 2021 06:18:20 UTC
The branch vendor/tzdata has been updated by philip:

URL: https://cgit.FreeBSD.org/src/log/?id=9530c11c3570..c28d35783173

c28d35783173 Import tzcode 2021d