Update 'sweep' submodule

diff --git a/sweep b/sweep
index 1e718510d6d9b121512ace8c43a9894e04b5f8f2..1553d9392686b6827ffcc6c870635a19a2818863 160000 (submodule)
--- a/sweep
+++ b/sweep
@@ -1 +1 @@
-Subproject commit 1e718510d6d9b121512ace8c43a9894e04b5f8f2
+Subproject commit 1553d9392686b6827ffcc6c870635a19a2818863