git: 4dfc0fa2870c..3673adf1ee31 - vendor/bc - vendor branch updated

From: Stefan Eßer <se_at_FreeBSD.org>
Date: Mon, 07 Mar 2022 22:12:11 UTC
The branch vendor/bc has been updated by se:

URL: https://cgit.FreeBSD.org/src/log/?id=4dfc0fa2870c..3673adf1ee31

3673adf1ee31 vendor/bc: import version 5.2.3