patch 8.2.4131: Vim9: calling function in autoload import does not work

Problem:    Vim9: calling function in autoload import does not work in a :def
            function.
Solution:   When a variable is not found and a PCALL follows use a funcref.
            (closes #9550)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4131,
 /**/
     4130,
 /**/