patch 8.2.2657: Vim9: error message for declaring variable in for loop

Problem:    Vim9: error message for declaring variable in for loop.
Solution:   Clear variables when entering block again. (closes #8012)
diff --git a/src/version.c b/src/version.c
index c1e795b..e09153f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2657,
+/**/
     2656,
 /**/
     2655,