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)
diff --git a/src/version.c b/src/version.c
index f7e3053..64a6077 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4131,
+/**/
     4130,
 /**/
     4129,