[stable21] Bump 3rdparty ref

Includes https://github.com/nextcloud/3rdparty/pull/782

Signed-off-by: Lukas Reschke <lukas@statuscode.ch>

diff --git a/3rdparty b/3rdparty
index fbc872de93b18d3e87367d00e281982eab74c5b9..1a42635cd768a1fff54b12666cd16f2236f7acd5 160000 (submodule)
--- a/3rdparty
+++ b/3rdparty
@@ -1 +1 @@
-Subproject commit fbc872de93b18d3e87367d00e281982eab74c5b9
+Subproject commit 1a42635cd768a1fff54b12666cd16f2236f7acd5