Installation Failure on MacBook Air M3, Mac OS Sequoia 15.0.1

When running "sudo gem install colorls" in Iterm2 the following error is displayed

ERROR: Error installing colorls:
The last version of public_suffix (>= 2.0.2, < 7.0) to support your Ruby & RubyGems was 5.1.1. Try installing it with `gem install public_suffix -v 5.1.1` and then running the current command again
public_suffix requires Ruby version >= 3.0. The current ruby version is 2.6.10.210.

Start by reproducing `sudo gem install colorls` on the reported MacBook Air M3 with Ruby 2.6.10.210. The issue does not name a file, test, or intended compatibility policy, so determine whether Ruby 2.6 should be supported before defining what a successful fix would be.

Written by the indexing model from the issue text.