Add Ruby 3.2 to the CI matrix

[ydah]

This PR is add Ruby 3.2 to the CI matrix
Because Ruby 3.2.0 is now in general release, it makes sense to add Ruby 3.2 to the CI matrix.

https://www.ruby-lang.org/en/news/2022/12/25/ruby-3-2-0-released/

[pirj]

It seems that we’re missing ruby2_keywords call somewhere

[ydah]

The following issue seem to be occurring

• ActionMailer fails on rails 6.1.6.1 and ruby 3.2 rails/rails#46883

Occurring errors:
https://github.com/rspec/rspec-rails/actions/runs/3837276670/jobs/6532393278#step:7:43

1. Configuration clears ActionMailer::Base::Deliveries after each example only has deliveries from this test (e.g. from email@example.com)
   Got 0 failures and 2 other errors:

   1.1) Failure/Error:
   def welcome(to:)
   mail(to: to, subject: 'subject', body: render(inline: "Hello", layout: false))
   end

     ArgumentError:
       wrong number of arguments (given 1, expected 0; required keyword: to)
   

[ydah]

[memo]

Rails 6.1 only receives security bug fixes. At the moment it doesn't work with Ruby 3.2.
rails/rails#46883 (comment)

[JonRowe]

You don't need to mention this, we only support supported Ruby versions for currently maintained Rails

[JonRowe]

Please revert formatting changes to .github/workflows/ci.yml

[ydah]

Thank you for your review. I updated this PR.

[pirj]

Thank you!