media-fonts/lxgw-neo-xihei: add 1.206, drop 1.205

[Linerre]

close #5250

[github-actions[bot]]

:heavy_check_mark: pkgcheck checks passed

• pkgcheck 0.10.30
• the corresponding ::gentoo commit: https://github.com/gentoo-mirror/gentoo/commit/2f8f5f966703d9b69a9de1dfb4139c455d0f927c