Update contents.json

Author: dkhamsing

contents.json

@@ -20109,7 +20109,7 @@
         "mapbox", "archive"
       ],
       "description": "Real-time messaging app using firebase",
-      "source": "https://github.com/vitaliy-paliy/Messenger",
+      "source": "https://github.com/opensourceios/Messenger",
       "screenshots": [
         "https://github.com/dkhamsing/open-source-ios-apps/assets/4723115/92116317-6b49-4167-af1f-5a11183e5a17"
       ],