radon dataset BASE_URL has changed - downloading fails with 403 redirect

Short description
The location (BASE_URL) of this dataset has changed. When attempting to use the 'Radon' dataset: download fails on a 403 redirect.

Environment information

• Operating System: Windows 11 (but should fail on all OSes)

• Python version: 3.13

• tensorflow-datasets version: 4.9.9

• tensorflow version: 2.20.0

• Does the issue still exists with the last tfds-nightly package (pip install --upgrade tfds-nightly) ? YES

Reproduction instructions

import tensorflow as tf
import tensorflow_datasets as tfds

data = tfds.load('radon', split='train', as_supervised=True)

If you share a colab, make sure to update the permissions to share it.

Link to logs
(https://gist.github.com/nanderoo/dab2f4b73832cafcbf9306669d8978c1)

Expected behavior
Dataset is downloaded and cached for future use.

Additional context
Encountered this while running a jupyter notebook example, but the error can be reproduced by simple python cli as well. I was able to work around this by manually updating the BASE_URL on line 31 for the Radon Dataset ~/lib/site-packages/tensorflow_datasets/datasets/radon/radon_dataset_builder.py to be: https://sites.stat.columbia.edu/gelman/arm/examples/radon/ which is where the 403 redirect takes you to now.

Start with the Radon dataset builder in radon_dataset_builder.py and inspect the BASE_URL around line 31. Reproduce the failure with the provided tfds.load('radon', split='train', as_supervised=True) example, update the dataset location to the working URL, and confirm the dataset downloads and is cached successfully.