patch 8.2.2749: Vim9: test for error can be a bit flaky

Problem:    Vim9: test for error can be a bit flaky.
Solution:   Increase the wait time a bit.
diff --git a/src/version.c b/src/version.c
index fa3a9a8..7785ac3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2749,
+/**/
     2748,
 /**/
     2747,