Drop support for Ruby 2.2 (and more?)

[dentarg]

With changes to RubyGems.org it seems like it will be impossible to use Ruby 2.2 on Ubuntu 22.04: ruby/setup-ruby#496 (comment)

What should be the new minimum Ruby version for Addressable?

Ruby 2.7 and below is EOL: https://www.ruby-lang.org/en/downloads/

[dentarg]

Reference: Puma require Ruby 2.4 or later: https://github.com/puma/puma/blob/6d3fd09e2d36bd63ccbb6bc71a980553aed9cc28/puma.gemspec#L31

[dentarg]

As a reference, Bundler 2.5.0 released today dropped support for Ruby 2.6 and Ruby 2.7. RubyGems 3.5.0 too.

[dentarg]

Good to know, JRuby 9.3 targets Ruby 2.6: https://en.wikipedia.org/wiki/JRuby#Release_history