patch 8.2.3857: Vim9: inconsistent error for using function()

Problem:    Vim9: inconsistent error for using function().
Solution:   Use a runtime type check for the result of function().
            (closes #8492)
diff --git a/src/version.c b/src/version.c
index 95bcb39..b3121d1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3857,
+/**/
     3856,
 /**/
     3855,