patch 8.2.1426: Vim9: cannot call autoload function in :def function

Problem:    Vim9: cannot call autoload function in :def function.
Solution:   Load the autoload script. (closes #6690)
diff --git a/src/version.c b/src/version.c
index 1ab7a61..6edd5ec 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1426,
+/**/
     1425,
 /**/
     1424,