patch 9.1.1356: Vim9: crash when unletting variable

Problem:  Vim9: crash when unletting variable
Solution: fix crash, allow to use :unlet
          (Hirohito Higashi)

closes: #17226

Signed-off-by: Hirohito Higashi <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 0c731a8..d820608 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1356,
+/**/
     1355,
 /**/
     1354,