Updates hydra: a681e95 Dist upgrade: check for requirements and current version

diff --git a/hydra b/hydra
index 41e1c808791bc632eebbd69a44614c98dc4432ce..a681e95d74eee2176aa9bf6800e8f541c4da7f35 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit 41e1c808791bc632eebbd69a44614c98dc4432ce
+Subproject commit a681e95d74eee2176aa9bf6800e8f541c4da7f35