Change ambient server domain (openhab#20159)

Signed-off-by: Mark Hilbush <mark@hilbush.com>

Author: mhilbush

bundles/org.openhab.binding.ambientweather/src/main/java/org/openhab/binding/ambientweather/internal/handler/AmbientWeatherEventListener.java

@@ -42,7 +42,7 @@
  */
 public class AmbientWeatherEventListener {
     // URL used to get the realtime event stream
-    private static final String REALTIME_URL = "https://api.ambientweather.net/?api=1&applicationKey=%APPKEY%";
+    private static final String REALTIME_URL = "https://rt2.ambientweather.net/?api=1&applicationKey=%APPKEY%";
 
     // JSON used to subscribe or unsubscribe from weather data events
     private static final String SUB_UNSUB_JSON = "{ apiKeys: [ '%APIKEY%' ] }";