fix(demo): update Flowing Code's logo in demos

Close #164

Author: paodb

src/test/java/com/flowingcode/vaadin/addons/googlemaps/CustomizedMarkerIconsDemo.java

@@ -41,7 +41,7 @@ protected void createGoogleMapsDemo(String apiKey) {
 
     // marker ONLY using an url for the marker's icon image
     gmaps.addMarker("Marker with only an URL as icon", gmaps.getCenter(), false,
-        "https://www.flowingcode.com/wp-content/uploads/2020/06/FCMarker.png");
+        "https://www.flowingcode.com/wp-content/uploads/2025/09/marker_1.png");
 
     // marker using a MarkerIcon, url icon image + customization
     MarkerIcon markerIcon = new MarkerIcon(Markers.GREEN);

src/test/java/com/flowingcode/vaadin/addons/googlemaps/GoogleMapsDemo.java

@@ -67,7 +67,7 @@ protected void createGoogleMapsDemo(String apiKey) {
             "Center",
             gmaps.getCenter(),
             false,
-            "https://www.flowingcode.com/wp-content/uploads/2020/06/FCMarker.png");
+            "https://www.flowingcode.com/wp-content/uploads/2025/09/marker_1.png");
     flowingmarker.addInfoWindow("<h1>Flowing Code</h1>");
 
     // add polygon with icons and click listener