Update sabre/xml to fix XML parsing errors

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

diff --git a/3rdparty b/3rdparty
index 10acc20198442f3c04bc1abbf9ad540a3afbab40..c3eaf5e97ae010355088a7851ff34bd4b7253bf0 160000 (submodule)
--- a/3rdparty
+++ b/3rdparty
@@ -1 +1 @@
-Subproject commit 10acc20198442f3c04bc1abbf9ad540a3afbab40
+Subproject commit c3eaf5e97ae010355088a7851ff34bd4b7253bf0