bump gossamer commit

diff --git a/gossamer b/gossamer
index c512088f2e7fb8ed6aace56202ff08408b252b44..af5471610a6da4df3c50ddb2a578b802536c60f6 160000 (submodule)
--- a/gossamer
+++ b/gossamer
@@ -1 +1 @@
-Subproject commit c512088f2e7fb8ed6aace56202ff08408b252b44
+Subproject commit af5471610a6da4df3c50ddb2a578b802536c60f6