Fix broken URL of ILSVRC2012
Fix broken URL of ILSVRC2012

Replace the old broken URL with the latest path.

`http://www.image-net.org/challenges/LSVRC/2012/downloads.php#images` -> `https://image-net.org/challenges/LSVRC/2012/2012-downloads.php#Images`
tensorflow/datasets,tensorflow/datasets,tensorflow/datasets,tensorflow/datasets,tensorflow/datasets