patch 8.2.1338: Vim9: assigning to script-local variable doesn't check type

Problem:    Vim9: assigning to script-local variable doesn't check type.
Solution:   Use the type. (issue #6591)
diff --git a/src/version.c b/src/version.c
index 661875a..fff706f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1338,
+/**/
     1337,
 /**/
     1336,