Update test signer chain again.

diff --git a/test/data b/test/data
index 4646df21d9c2a5729b549c7dcbb33be622bf3ba7..6e8b533930445626c7f92bc9a11d2ab36e0546c5 160000 (submodule)
--- a/test/data
+++ b/test/data
@@ -1 +1 @@
-Subproject commit 4646df21d9c2a5729b549c7dcbb33be622bf3ba7
+Subproject commit 6e8b533930445626c7f92bc9a11d2ab36e0546c5