patch 8.2.3511: Vim9: entry for loop variable is created every round

Problem:    Vim9: entry for loop variable is created every round.
Solution:   Only create the entry once. (closes #8996)
diff --git a/src/version.c b/src/version.c
index d1f079c..f4e9f9f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3511,
+/**/
     3510,
 /**/
     3509,