patch 9.0.1684: Update libvterm to rev 839 Commit: https://github.com/vim/vim/commit/b00df7aa388994119346a21d77b0d0db2a0a5e9f Author: zeertzjq <zeertzjq@outlook.com> Date: Tue Aug 8 11:03:00 2023 +0800 patch 9.0.1684: Update libvterm to rev 839 Problem: libvterm slightly outdated Solution: Update libvterm from rev 818 to rev 839 Notable fix: libvterm now handles DECSM/DECRM with multiple arguents, so several ncurses programs (e.g. nnn) can enable mouse properly when run in Vim's terminal in XTerm. closes: #12746 Signed-off-by: Christian Brabandt <cb@256bit.org> Co-authored-by: zeertzjq <zeertzjq@outlook.com>