patch 8.2.2681: Vim9: test fails for redeclaring script variable

Problem:    Vim9: test fails for redeclaring script variable.
Solution:   It's OK to assign to an existing script variable in legacy.
diff --git a/src/version.c b/src/version.c
index d448b94..104073d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2681,
+/**/
     2680,
 /**/
     2679,