patch 8.2.4083: Vim9: no test for "vim9script autoload' using script variable

Problem:    Vim9: no test for "vim9script autoload' and using script variable
            in the same script.
Solution:   Add a simple test.  Fix uncovered problem.
diff --git a/src/version.c b/src/version.c
index 2a2c3de..ecfa17d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4083,
+/**/
     4082,
 /**/
     4081,