patch 9.0.0726: looping over list of lists works in script, not in function

Problem:    Looping over list of lists and changing the list contents works in
            Vim9 script, not in a compiled function.
Solution:   Mark the loop variable final instead of const. (closes #11347)

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    726,
 /**/
     725,
 /**/