patch 8.2.1682: Vim9: const works in an unexpected way

Problem:    Vim9: const works in an unexpected way.
Solution:   ":const" only disallows changing the variable, not the value.
            Make "list[0] = 9" work at the script level.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1682,
 /**/
     1681,
 /**/