Updates hydra: 4b15986 Adds .sync-tpc-ignore support at sync-tpc

diff --git a/hydra b/hydra
index d6ed8f17ce9f5ba0954b46e63c03fd3667b03b47..4b1598690c8859acbe6e2779496f05020921c9ae 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit d6ed8f17ce9f5ba0954b46e63c03fd3667b03b47
+Subproject commit 4b1598690c8859acbe6e2779496f05020921c9ae