version.c: update [ci skip] (#12581)

vim-patch:8.2.1107: 'imactivatefunc' and 'imstatusfunc' are not used in the GUI
vim-patch:8.2.1115: iminsert test fails when compiled with VIMDLL
vim-patch:8.2.1119: configure fails with Xcode 12 beta

src/nvim/version.c

@@ -375,7 +375,7 @@ static const int included_patches[] = {
   1546,
   1545,
   // 1544,
-  // 1543,
+  1543,
   1542,
   1541,
   1540,