Update tensorflow-datasets requirement (#337)

Updates the requirements on [tensorflow-datasets](https://github.com/tensorflow/datasets) to permit the latest version.
- [Release notes](https://github.com/tensorflow/datasets/releases)
- [Changelog](https://github.com/tensorflow/datasets/blob/master/CHANGELOG.md)
- [Commits](tensorflow/datasets@v1.3.0...v4.7.0)

---
updated-dependencies:
- dependency-name: tensorflow-datasets
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

setup.py

@@ -20,7 +20,7 @@ def readme():
     python_requires=">=3.6",
     install_requires=[
         "click>=7.0,<8.2.0",
-        "tensorflow-datasets>=1.3.0,<4.7.0",
+        "tensorflow-datasets>=1.3.0,<4.8.0",
         "typeguard>=2.5.1,<2.14.0",
         "importlib-metadata ~= 2.0 ; python_version<'3.8'",
     ],