git: 23aff1240891..e63540eed295 - vendor/bc - vendor branch updated

From: Stefan Eßer <se_at_FreeBSD.org>
Date: Tue, 30 Nov 2021 17:35:55 UTC
The branch vendor/bc has been updated by se:

URL: https://cgit.FreeBSD.org/src/log/?id=23aff1240891..e63540eed295

e63540eed295 vendor/bc: import release 5.2.1