man: Update to version 2.12.0

man: Update to version 2.12.0

- Update from version 2.11.2 to 2.12.0
- Update of rootfile
- Changelog
    2.12.0
	Fixes:
	 * Fix some manual page portability issues with groff 1.23.0.
	 * Fix test failures when a working `iconv` is not available.
	 * Ensure that timestamps read from the database can go past the year 2038,
	   even on systems where this is not the default.
	 * Fix `manpath` not parsing `PATH` entries with trailing slash correctly
	   for guessing `MANPATH` entries.
	 * More accurately document the behaviour of passing file names as arguments
	   to `man` without the `-l`/`--local-file` option.
	 * Avoid duplicate cleanup of old cat pages by both `man-db.service` and
	   `systemd-tmpfiles-clean.service`.
	Improvements:
	 * Update system call lists in `seccomp` sandbox from `systemd`.
	 * Upgrade to Gnulib `stable-202307`.
	 * Work around the Firebuild accelerator in `seccomp` sandbox: if this is in
	   use then we need to allow some socket-related system calls.
	 * `man -K` now deduplicates search results that point to the same page.
	 * Warn if `mandb` drops to `--user-db` mode due to running as the wrong
	   user.
	 * Change section title recommendations in `man(1)` to mention `STANDARDS`
	   rather than `CONFORMING TO`, in line with `man-pages(7)`.
	 * Add a `STANDARDS` section to `man(1)` itself.
	 * Document that `man -K` may suffer from false negatives as well as false
	   positives.
	 * Take advantage of newer `groff` facilities to implement `man
	   --no-hyphenation` and `man --no-justification`, if available.
	 * `man -f` and `man -k` now pass any `-r`/`--regex` or `-w`/`--wildcard`
	   options on to `whatis` and `apropos` respectively.
	 * Always pass a line length to `nroff`, even if we believe that it matches
	   the default.
	 * Allow disabling `groff` warnings via `man --warnings`, by prefixing a
	   warning name with `!`.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>