Use cut down cesium-native branch.

kring · kring · commit 52b40699ce52 · 2025-10-17T14:59:42.000+11:00
diff --git a/extern/cesium-native b/extern/cesium-native
@@ -1 +1 @@
-Subproject commit 1cdb48a8daf12550087256045efdc8f998350000
+Subproject commit 56765ef3f262ba2ce79b70b998e823aedea76b40
