patch 8.2.2540: Vim9: no error for using script var name for argument

Problem:    Vim9: no error for using script var name for argument.
Solution:   Check for this error. (closes #7868)
diff --git a/src/version.c b/src/version.c
index b096340..25ea70b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2540,
+/**/
     2539,
 /**/
     2538,