patch 8.2.1764: Vim9: no error when assigning to script var with wrong type

Problem:    Vim9: no error when assigning to script var with wrong type.
Solution:   Fix off-by-one error. (closes #7028)
diff --git a/src/version.c b/src/version.c
index 60ab7d1..4b459f2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1764,
+/**/
     1763,
 /**/
     1762,