www/ruby-puma: update to 6.4.0

6.4.0 (2023-09-21)

Features

* on_thread_exit hook ([#2920])
* on_thread_start_hook ([#3195])
* Shutdown on idle ([#3209], [#2580])
* New error message when control server port taken ([#3204])

Refactor

* Remove Forwardable dependency ([#3191], #3190)
* Update URLMap Regexp usage for Ruby v3.3 ([#3165])

Bugfixes

* Bring the cert_pem: parameter into parity with the cert: parameter to
  ssl_bind. ([#3174])
* Fix using control server with IPv6 host ([#3181])
* control_cli.rb - add require_relative 'log_writer' ([#3187])
* Fix cases where fallback Rack response wasn't sent to the client ([#3094])

(taca)