Use argument forwarding operator for add_provider

[nilsding]

This resolves an ArgumentError I had with using configurate with Ruby 3.2. For some reason this was still fine until Ruby 3.1:

# frozen_string_literal: true

require 'configurate'
require 'configurate/provider/toml'

Config = Configurate::Settings.create do
  add_provider Configurate::Provider::Env
  add_provider Configurate::Provider::TOML, 'config/app_config.toml', required: false  # this breaks with 3.2
end

ArgumentError: wrong number of arguments (given 2, expected 1)
/Users/foxy/src/some_rails_app/config/initializers/00_config.rb:8:in `block in <main>'
/Users/foxy/src/some_rails_app/config/initializers/00_config.rb:6:in `<main>'
/Users/foxy/src/some_rails_app/config/environment.rb:7:in `<main>'

Solution: use the argument forwarding operator that was shipped with Ruby 2.7.
If support for older Ruby versions is still a requirement there is also the possibility to use ruby2_keywords which was introduced with 2.7 as well, but there is a compatibility gem for that. I created a separate branch with that approach: main...nilsding:configurate:ruby2-keywords

[jhass]

Great!

Dropping 2.3 support, we'll need to update https://github.com/jhass/configurate/blob/main/.github/workflows/ci.yml#L17 too :)

[nilsding]

Updated the test matrix, for some reason GitHub does not see the new commit in this PR though. Must be another Monday morning ;-)

[nilsding]

ah, there's the commit now! 🎉

[jhass]

Thank you ❤️