fix assert message

Author: attila-papai

tests/integration/test_data_rows.py

@@ -998,7 +998,8 @@ def test_create_data_row_with_media_type(dataset, image_url):
     with pytest.raises(labelbox.exceptions.InvalidQueryError) as exc:
         dr = dataset.create_data_row(
             row_data={'invalid_object': 'invalid_value'}, media_type="IMAGE")
-    assert "Found invalid contents for media type: \'IMAGE\'" in str(exc.value)
+    assert "Media type validation failed, expected: 'image/*', was: application/json" in str(
+        exc.value)
 
     dataset.create_data_row(row_data=image_url, media_type="IMAGE")