Update app.py

app.py

@@ -36,7 +36,7 @@ examples = [
     ["images/posing-sample-image3.jpg", 0.25, 0.45, 300, "yolo11n-pose.pt"],
     ["images/posing-sample-image4.jpg", 0.25, 0.45, 300, "yolo11s-pose.pt"],
     ["images/posing-sample-image1.jpg", 0.25, 0.45, 300, "yolo12n-pose.pt"],
-    ["images/posing-sample-image2.jpg", 0.25, 0.45, 300, "yolo12s-pose.pt"],
+    ["images/posing-sample-image2.png", 0.25, 0.45, 300, "yolo12s-pose.pt"],
 ]
 
 # Title, description, and article for the interface