Update firebase-common/src/main/java/com/google/firebase/emulators/EmulatedServiceSettings.java

Co-authored-by: Vladimir Kryachko <[email protected]>

Author: samtstern

firebase-common/src/main/java/com/google/firebase/emulators/EmulatedServiceSettings.java

@@ -24,7 +24,7 @@
  * @see EmulatorSettings
  * @hide
  */
-public class EmulatedServiceSettings {
+public final class EmulatedServiceSettings {
 
   public final String host;
   public final int port;