patch 8.2.1286: Vim9: No error when using a type to a window variable

Problem:    Vim9: No error when using a type to a window variable
Solution:   Recognize the syntax and give an error. (closes #6521)
diff --git a/src/version.c b/src/version.c
index 5563bd1..fc86f15 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1286,
+/**/
     1285,
 /**/
     1284,