:art: Update libcmdarg

diff --git a/libcmdapp b/libcmdapp
index 6d39da65b3eee1538c6fb4f4883b7f9072485050..5d6fcef49becc27d88123eeb3977c355bfde94ae 160000 (submodule)
--- a/libcmdapp
+++ b/libcmdapp
@@ -1 +1 @@
-Subproject commit 6d39da65b3eee1538c6fb4f4883b7f9072485050
+Subproject commit 5d6fcef49becc27d88123eeb3977c355bfde94ae