man-db: upgrade 2.12.0 -> 2.12.1

man-db: upgrade 2.12.0 -> 2.12.1

0001-man-Move-local-variable-declaration-to-function-scop.patch
refreshed for 2.23.1

Changelog:
=============
* Fix excessive cleanup of '/var/cache/man' by 'systemd-tmpfiles'.
* 'man' matches the display width more accurately to the configured width.
* Upgrade to Gnulib 'stable-202401'.
* Mention 'groff''s 'pdf' device in 'man(1)'.
* Speed up 'seccomp' filter slightly.
* Document how to format pages using italic rather than underlined text.
* Remove the obsolete 'chconfig' tool for converting man-db configuration
  files to the FHS.  This transition took place almost 25 years ago (at
  least in Debian), so it's not worth keeping it around now.

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>