Update replication plugin to latest revision

- Revert "Replicate HEAD reference when replicating a project"

Change-Id: I623ca44a78f74e9934860cf9ca9dfe69d144c439

plugins/replication

diff --git a/plugins/replication b/plugins/replication
index 7472fd7..8723423 160000
--- a/plugins/replication
+++ b/plugins/replication
@@ -1 +1 @@
-Subproject commit 7472fd77f5a2114e85d93f89b025ddeac37f269f
+Subproject commit 8723423376077a0f71499006f8d1524f49a53c81