patch 8.2.3923: Vim9: double free with split argument list in nested function

Problem:    Vim9: double free if a nested function has a line break in the
            argument list.
Solution:   Set cmdlinep when freeing the previous line.

src/version.c

@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3923,
 /**/
     3922,
 /**/