patch 8.2.3991: Vim9: error when extending dict<any>

Problem:    Vim9: error when extending dict<any> with another type that it was
            initialized with.
Solution:   Also set the type for dict<any> if the initializer has a more
            specific type. (closes #9461)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3991,
 /**/
     3990,
 /**/