update cyrus-sasl

diff --git a/cyrus-sasl b/cyrus-sasl
index 903a7fe..4f521b6 160000 (submodule)
--- a/cyrus-sasl
+++ b/cyrus-sasl
@@ -1 +1 @@
-Subproject commit 903a7fe023f6cd156451ccc35ab819500f520dcd
+Subproject commit 4f521b66718754941617a28da164d1daa3b9041c