bump gossamer commit

diff --git a/gossamer b/gossamer
index 64e8e93e0c7bb42c08c114edc5c38584e8b77795..ac3923bce85cd8ff2d44239b62f05a83f3580c4b 160000 (submodule)
--- a/gossamer
+++ b/gossamer
@@ -1 +1 @@
-Subproject commit 64e8e93e0c7bb42c08c114edc5c38584e8b77795
+Subproject commit ac3923bce85cd8ff2d44239b62f05a83f3580c4b