Update litani submodule

Mark R. Tuttle · markrtuttle · commit 7818fa03cdb3 · 2021-01-11T20:30:01.000-05:00
diff --git a/test/cbmc/litani b/test/cbmc/litani
@@ -1 +1 @@
-Subproject commit fcc583c4a5d5b9bebbefce5626256283fab1edda
+Subproject commit 3fc5e02bc17483352546ac4c81078fde64cab674
