Updates hydra: 042cc90 Fix: hydractl: trac-upgrade: check for Trac installation

diff --git a/hydra b/hydra
index 54c1158aff8b987dea88b35597047fafe92cd0a7..042cc90fad9f88e8834052441110c1dae5ffa809 160000 (submodule)
--- a/hydra
+++ b/hydra
@@ -1 +1 @@
-Subproject commit 54c1158aff8b987dea88b35597047fafe92cd0a7
+Subproject commit 042cc90fad9f88e8834052441110c1dae5ffa809