Bug 1873280 - Update Firebase Cloud Messaging to version 23.4.0

Author: rvandermeulen

android-components/plugins/dependencies/src/main/java/DependenciesPlugin.kt

@@ -91,7 +91,7 @@ object Versions {
     }
 
     object Firebase {
-        const val messaging = "23.3.1"
+        const val messaging = "23.4.0"
     }
 }