patch 8.2.4225: Vim9: depth argument of :lockvar not parsed in :def function

Problem:    Vim9: depth argument of :lockvar not parsed in :def function.
Solution:   Parse the optional depth argument. (closes #9629)
            Fix that locking doesn't work for a non-materialize list.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4225,
 /**/
     4224,
 /**/