patch 9.0.0459: Vim9: block in for loop doesn't behave like a code block

Problem:    Vim9: block in for loop doesn't behave like a code block.
Solution:   Use a new block ID for each loop at the script level.

src/version.c

@@ -703,6 +703,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    459,
 /**/
     458,
 /**/