Updates hydra: 7178415 Adds aperiodic-upgrade

diff --git a/hydra b/hydra
index 87b669d7fe280c99eebd4870d5f084493552c078..71784150d00655e8ebfb65026ea97e2d9dd6fb68 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit 87b669d7fe280c99eebd4870d5f084493552c078
+Subproject commit 71784150d00655e8ebfb65026ea97e2d9dd6fb68