git: 987ba809b8ad..f83ac37f1e66 - vendor/expat - vendor branch updated

From: Xin LI <delphij_at_FreeBSD.org>
Date: Mon, 17 Jan 2022 02:56:11 UTC
The branch vendor/expat has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/log/?id=987ba809b8ad..f83ac37f1e66

f83ac37f1e66 Vendor import of expat 2.4.3.