patch 8.2.4505: Vim9: outdated "autocmd nested" still works

Problem:    Vim9: outdated "autocmd nested" still works.
Solution:   Do not accept the :autocmd argument "nested" without "++" in Vim9
            script.
diff --git a/src/version.c b/src/version.c
index e1ca0d7..5f703c4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4505,
+/**/
     4504,
 /**/
     4503,