[corlib] Bump reference souces. Fixes #29808

diff --git a/external/referencesource b/external/referencesource
index 953bb1dd278b5e0ae9e74544815d7351743fee2d..49534f8e7ac0682c4e06f1948bdc6f068483c04d 160000 (submodule)
--- a/external/referencesource
+++ b/external/referencesource
@@ -1 +1 @@
-Subproject commit 953bb1dd278b5e0ae9e74544815d7351743fee2d
+Subproject commit 49534f8e7ac0682c4e06f1948bdc6f068483c04d