git: 0ff539eb7ca5..438a1101dc1f - vendor/bc - vendor branch updated

From: Stefan Eßer <se_at_FreeBSD.org>
Date: Sun, 30 Apr 2023 17:59:26 UTC
The branch vendor/bc has been updated by se:

URL: https://cgit.FreeBSD.org/src/log/?id=0ff539eb7ca5..438a1101dc1f

438a1101dc1f contrib/bc: import version 6.5.0