Update buck version to match Gerrit master branch

Change-Id: Ie19632978e4e1ca20e32ee3422406c0dc3c73dd9
diff --git a/buckversion b/buckversion
index 128a75f..efb68ec 100644
--- a/buckversion
+++ b/buckversion
@@ -1 +1 @@
-6a19cf921c107ea0f1751e4f84c639e5050e2da7
+fd3105a0b62899f74662f4cdc156de6990bdc24c