Update doctest

Depends-on: https://cesnet-gerrit-czechlight/c/CzechLight/dependencies/+/2597
Depends-on: https://gerrit.cesnet.cz/c/CzechLight/dependencies/+/2597
Change-Id: I2f98a5e92dd960b2f3ce83d11434730f7fc4c721
diff --git a/submodules/dependencies b/submodules/dependencies
index 676f63b..ab68d53 160000
--- a/submodules/dependencies
+++ b/submodules/dependencies
@@ -1 +1 @@
-Subproject commit 676f63bcbf2a14140bf303a51b1fa73d9b8f27d2
+Subproject commit ab68d53de22d1ce6ead243a612538e6244522ff6