Fix broadcast logging in rails 7.1+

[iuri-gg]

What is the purpose of this pull request?

Fixes issue with Rails 7.1. Previous fix sets Anycable.logger to an instance of BroadcastLogger with two loggers (console and previous instance of BroadcastLogger). This nested BroadcastLogger breaks with following error:

undefined method `current_tags' for nil:NilClass:
/Users/iuri/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/actioncable-7.1.1/lib/action_cable/connection/tagged_logger_proxy.rb:25:in `tag'
/Users/iuri/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/actioncable-7.1.1/lib/action_cable/connection/tagged_logger_proxy.rb:40:in `log'
/Users/iuri/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/actioncable-7.1.1/lib/action_cable/connection/tagged_logger_proxy.rb:34:in `block (2 levels) in <class:TaggedLoggerProxy>'
/Users/iuri/.rbenv/versions/3.2.2/lib/ruby/gems/3.2.0/gems/anycable-rails-core-1.4.1/lib/anycable/rails/connection.rb:89:in `handle_open'
...

What changes did you make? (overview)

Use official #broadcast_to API

Is there anything you'd like reviewers to focus on?

Checklist

• I've added tests for this change
• I've added a Changelog entry
• I've updated documentation

[palkan]

Thanks! Just in time for the release.