Update litani submodule to version 1.6.0 (#210)

nrdg42 · web-flow · commit 94476a4383b3 · 2021-03-12T13:33:26.000-08:00
diff --git a/test/litani b/test/litani
@@ -1 +1 @@
-Subproject commit 3fc5e02bc17483352546ac4c81078fde64cab674
+Subproject commit b652295078e26f8444c72ee3088f6a1230624827
