patch 8.2.3407: using uninitialized memory with "let g:['bar'] = 2"

Problem:    Using uninitialized memory with "let g:['bar'] = 2".
Solution:   Initialize v_type of a new dict item.
diff --git a/src/version.c b/src/version.c
index d56e443..6301d77 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3407,
+/**/
     3406,
 /**/
     3405,