Updates hydra: 78dc21b Fix: hydractl: provision-raspi: make armhf the default archite...

diff --git a/hydra b/hydra
index 1bb03e331554730f1823125441d8c73b696c4fb4..78dc21bfef3f76ccb8c35fc055daa9857ea8a196 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit 1bb03e331554730f1823125441d8c73b696c4fb4
+Subproject commit 78dc21bfef3f76ccb8c35fc055daa9857ea8a196