Update libyang for the yang:key XML namespace fix

Change-Id: Ibe732b83b16998b30b3adaa661e988113b539096
Depends-on: https://cesnet-gerrit-czechlight/c/CzechLight/dependencies/+/2693
Depends-on: https://cesnet-gerrit-public/c/CzechLight/dependencies/+/2693
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/dependencies/+/2693
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/cla-sysrepo/+/2694
diff --git a/submodules/dependencies b/submodules/dependencies
index ee828ba..54d08f7 160000
--- a/submodules/dependencies
+++ b/submodules/dependencies
@@ -1 +1 @@
-Subproject commit ee828ba8f359e72f2ab73e1fc2eb779b4f511ad8
+Subproject commit 54d08f722edff647694caded51eda657d6cfa836