patch 8.2.4279: Vim9: cannot change item type with map() after range()

Problem:    Vim9: cannot change item type with map() after range().
Solution:   Split the return type in current type and declared type.
            (closes #9665)

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4279,
 /**/
     4278,
 /**/