Log Message:
ruby-public_suffix: update to 6.0.1.

Upstream changelog (from CHANGELOG.md):

6.0.1

 Changed

  * Updated definitions.

6.0.0

Same as 5.1.0. Re-releasing as a major version change due to a major ruby
version requirement change.

 Changed

  * Updated definitions.
  * Minimum Ruby version is 3.0

5.1.1

No significant changes. Releasing a mini version to address 5.1.0 release with
major ruby requirement change (GH-315).