patch 8.2.2080: Vim9: no proper error message for using s:var in for loop

Problem:    Vim9: no proper error message for using s:var in for loop.
Solution:   Give a specific error.
diff --git a/src/version.c b/src/version.c
index 3a20581..e3d5b6e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2080,
+/**/
     2079,
 /**/
     2078,