patch 8.2.3646: using <sfile> in a function gives an unexpected result

Problem:    Using <sfile> in a function gives an unexpected result.
Solution:   Give an error in a Vim9 function. (issue #9189)

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3646,
 /**/
     3645,
 /**/