malaria dataset URL is out of date
**Short description**
The malaria dataset cannot be downloaded, because the encoded URL is out-of-date.

**Environment information**
* Operating System: Fedora 34
* Python version: 3.9.7
* `tensorflow-datasets`/`tfds-nightly` version: `tensorflow-datasets` 4.5.2
* `tensorflow`/`tf-nightly` version: `tensorflow` 2.8.0

* Does the issue still exists with the last `tfds-nightly` package (`pip install --upgrade tfds-nightly`) ? yes

**Reproduction instructions**

```python
builder = tfds.builder('malaria', data_dir=os.path.join(".", "data"))
builder.download_and_prepare()
```

**Link to logs**
https://gist.github.com/MaximLippeveld/904dc4cd7f7eaabf96291af5e9199d32

**Expected behavior**
Download malaria dataset.

**Additional context**

diff --git a/tensorflow_datasets/image_classification/malaria.py b/tensorflow_datasets/image_classification/malaria.py
index 0ba3b97fa..78b0e797e 100644
--- a/tensorflow_datasets/image_classification/malaria.py
+++ b/tensorflow_datasets/image_classification/malaria.py
@@ -21,7 +21,7 @@ import os
 import tensorflow as tf
 import tensorflow_datasets.public_api as tfds
 
-_URL = "https://ceb.nlm.nih.gov/proj/malaria/cell_images.zip"
+_URL = "https://data.lhncbc.nlm.nih.gov/public/Malaria/cell_images.zip"
 
 _DESCRIPTION = ("""The Malaria dataset contains a total of 27,558 cell images
 with equal instances of parasitized and uninfected cells from the thin blood 
['tensorflow_datasets/image_classification/malaria.py']