Update git submodules

* Update plugins/cookbook-plugin from branch 'stable-2.13'
  - HelloWebLink: Make the dummy image more visible
    
    Change-Id: If2b80d5fd2f719ebd1db4c9b15f5c8e50f5cda3f
    
diff --git a/plugins/cookbook-plugin b/plugins/cookbook-plugin
index 375de37..536beda 160000
--- a/plugins/cookbook-plugin
+++ b/plugins/cookbook-plugin
@@ -1 +1 @@
-Subproject commit 375de37939e2b016d3042c20853ce699d54e7a94
+Subproject commit 536beda3ab4f6f8d8d8c5be1e3cf0e6b4e9b10d5