patch 8.2.3666: libvterm is outdated

Problem:    Libvterm is outdated.
Solution:   Include patches from revision 769 to revision 789.
diff --git a/Filelist b/Filelist
index 1ab6e1b..f89289d 100644
--- a/Filelist
+++ b/Filelist
@@ -377,6 +377,7 @@
 		src/libvterm/t/30state_pen.test \
 		src/libvterm/t/31state_rep.test \
 		src/libvterm/t/32state_flow.test \
+		src/libvterm/t/40state_selection.test \
 		src/libvterm/t/60screen_ascii.test \
 		src/libvterm/t/61screen_unicode.test \
 		src/libvterm/t/62screen_damage.test \