patch 8.2.4258: Coverity warns for array overrun

Problem:    Coverity warns for array overrun.
Solution:   Restrict depth to MAXWLEN - 1.
diff --git a/src/version.c b/src/version.c
index 0d84d58..a0f0037 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4258,
+/**/
     4257,
 /**/
     4256,