Update to the latest serialization library for release

Signed-off-by: Eric Kunze <eric.kunze@arm.com>
Change-Id: Ia6653d960c8ae5407f098c476fbaf6287a321c82
diff --git a/third_party/serialization_lib b/third_party/serialization_lib
index bdcc3fe..8fcef21 160000
--- a/third_party/serialization_lib
+++ b/third_party/serialization_lib
@@ -1 +1 @@
-Subproject commit bdcc3fee1b8bf55aac50e060115b92a1ccf9741c
+Subproject commit 8fcef215fdbb6f6423fc96f0af40f1f4e248fffb