patch 8.2.1996: Vim9: invalid error for argument of extend()

Problem:    Vim9: invalid error for argument of extend().
Solution:   Check if the type could match. (closes #7299)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1996,
 /**/
     1995,
 /**/