libarchive: Update to version 3.8.1

libarchive: Update to version 3.8.1

- Update from version 3.8.0 to 3.8.1
- Update of rootfile
- Changelog
    3.8.1
      Notable bugfixes:
	libarchive: fix FILE_skip regression (#2642)
	compress: Prevent call stack overflow (#2649)
	iso9660: always check archive_string_ensure return value (#2651)
	tar: Support negative time values with pax (#2634)
	tar: Reset accumulated header state after reading macOS metadata blob (#2636)
	tar: Keep block alignment after pax error (#2637)
	tar: Handle extra bytes after sparse entries (#2643)
	windows: check archive_wstring_ensure return value (#2652)

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>