patch 8.2.1140: Vim9: return type of extend() is any

Problem:    Vim9: return type of extend() is any.
Solution:   Use type of the argument.
diff --git a/src/version.c b/src/version.c
index 23d2d1b..116cb06 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1140,
+/**/
     1139,
 /**/
     1138,