Update Buck version to match Gerrit

Change-Id: I678e5ba291cdc741e95f502cf532c49d22399108
diff --git a/buckversion b/buckversion
index d92623e..a0a14f6 100644
--- a/buckversion
+++ b/buckversion
@@ -1 +1 @@
-000aca10393d9a0fc133715650b9baa84fd5457a
+eccd368bcde0683658cd535f93852a27b5b2b5ff