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.
diff --git a/src/version.c b/src/version.c
index f8d7212..d5996e9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1682,
+/**/
     1681,
 /**/
     1680,