Patch MNN test order bug (#17290)

Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

tests/test_exports.py

@@ -193,14 +193,14 @@ def test_export_paddle():
 
 
 @pytest.mark.slow
-def test_export_ncnn():
-    """Test YOLO exports to NCNN format."""
-    file = YOLO(MODEL).export(format="ncnn", imgsz=32)
+def test_export_mnn():
+    """Test YOLO exports to MNN format (WARNING: MNN test must precede NCNN test or CI error on Windows)."""
+    file = YOLO(MODEL).export(format="mnn", imgsz=32)
     YOLO(file)(SOURCE, imgsz=32)  # exported model inference
 
 
 @pytest.mark.slow
-def test_export_mnn():
-    """Test YOLO exports to MNN format."""
-    file = YOLO(MODEL).export(format="mnn", imgsz=32)
+def test_export_ncnn():
+    """Test YOLO exports to NCNN format."""
+    file = YOLO(MODEL).export(format="ncnn", imgsz=32)
     YOLO(file)(SOURCE, imgsz=32)  # exported model inference