Fix YOLOv8 C++ Example model input size (#15665)

Co-authored-by: Glenn Jocher <glenn.jocher@ultralytics.com>

examples/YOLOv8-CPP-Inference/main.cpp

@@ -24,7 +24,7 @@ int main(int argc, char **argv)
     //
 
     // Note that in this example the classes are hard-coded and 'classes.txt' is a place holder.
-    Inference inf(projectBasePath + "/yolov8s.onnx", cv::Size(640, 480), "classes.txt", runOnGPU);
+    Inference inf(projectBasePath + "/yolov8s.onnx", cv::Size(640, 640), "classes.txt", runOnGPU);
 
     std::vector<std::string> imageNames;
     imageNames.push_back(projectBasePath + "/ultralytics/assets/bus.jpg");