Merge branch 'sync_fix' into 'master'

Make FCM message priority high

See merge request entgra/carbon-device-mgt!740

components/device-mgt-extensions/org.wso2.carbon.device.mgt.extensions.push.notification.provider.fcm/src/main/java/org/wso2/carbon/device/mgt/extensions/push/notification/provider/fcm/FCMNotificationStrategy.java

@@ -126,6 +126,7 @@ public class FCMNotificationStrategy implements NotificationStrategy {
         JsonObject fcmRequest = new JsonObject();
         fcmRequest.addProperty("delay_while_idle", false);
         fcmRequest.addProperty("time_to_live", TIME_TO_LIVE);
+        fcmRequest.addProperty("priority", "high");
 
         //Add message to FCM request
         JsonObject data = new JsonObject();