git: cbc620a473ce..5223d1d95fdd - vendor/libevent - vendor branch updated

From: Cy Schubert <cy_at_FreeBSD.org>
Date: Tue, 14 Nov 2023 23:57:25 UTC
The branch vendor/libevent has been updated by cy:

URL: https://cgit.FreeBSD.org/src/log/?id=cbc620a473ce..5223d1d95fdd

5223d1d95fdd libevent: Import libevent 2.1.12