git: a3f3a7b4dc80..52a5ec1b178f - vendor/bc - vendor branch updated

From: Stefan Eßer <se_at_FreeBSD.org>
Date: Thu, 04 Jan 2024 23:10:20 UTC
The branch vendor/bc has been updated by se:

URL: https://cgit.FreeBSD.org/src/log/?id=a3f3a7b4dc80..52a5ec1b178f

52a5ec1b178f vendor/bc: upgrade to version 6.7.5