version.c: update [ci skip] (#9444)

vim-patch:8.0.1336: cannot use imactivatefunc() unless compiled with +xim
vim-patch:8.0.1338: USE_IM_CONTROL is confusing and incomplete

vim-patch:8.1.0646: cannot build with Ruby 2.6.0
vim-patch:8.1.0656: trying to reconnect to X server may cause problems
vim-patch:8.1.0664: configure "fail-if-missing" does not apply to enable-gui

src/nvim/version.c

@@ -1641,7 +1641,7 @@ static const int included_patches[] = {
   289,
   288,
   287,
-  // 286,
+  286,
   285,
   284,
   283,
@@ -1676,7 +1676,7 @@ static const int included_patches[] = {
   254,
   253,
   252,
-  // 251,
+  251,
   250,
   249,
   248,