patch 8.2.2463: using :arglocal in an autocommand may use freed memory

Problem:    Using :arglocal in an autocommand may use freed memory.
            (houyunsong)
Solution:   Check if the arglist is locked.
diff --git a/src/version.c b/src/version.c
index a7288f3..53ed13c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2463,
+/**/
     2462,
 /**/
     2461,