patch 8.2.2436: Vim9 script test is a bit flaky

Problem:    Vim9 script test is a bit flaky.
Solution:   Wait longer for exit callback.
diff --git a/src/version.c b/src/version.c
index 1347dec..768b3af 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2436,
+/**/
     2435,
 /**/
     2434,