patch 8.2.1465: Vim9: subscript not handled properly

Problem:    Vim9: subscript not handled properly.
Solution:   Adjust error message.  Remove dead code.  Disallow string to
            number conversion in scripts.

src/version.c

@@ -754,6 +754,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1465,
 /**/
     1464,
 /**/