Updates hydra: 5f28219 Use --batch at hydra_import_keys_openpgp

diff --git a/hydra b/hydra
index aa0e58fb719abf9081179ef122f93a3a11356067..5f28219deaf99a79401a080c52a60b8c2b06d1e6 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit aa0e58fb719abf9081179ef122f93a3a11356067
+Subproject commit 5f28219deaf99a79401a080c52a60b8c2b06d1e6