no more warning on rackup

Gemfile

@@ -5,7 +5,9 @@ gem 'bootsnap', require: false
 gem 'importmap-rails'
 gem 'pg'
 gem 'puma'
+gem 'rackup'
 gem 'rails'
+gem 'rails_semantic_logger'
 gem 'sprockets-rails'
 gem 'stimulus-rails'
 gem 'tailwindcss-rails'
@@ -18,7 +20,6 @@ group :development do
   gem 'debug'
   gem 'error_highlight'
   gem 'htmlbeautifier'
-  gem 'rails_semantic_logger'
   gem 'rainbow'
   gem 'rubocop', require: false
   gem 'rubocop-packaging'

Gemfile.lock

@@ -344,6 +344,7 @@ DEPENDENCIES
   importmap-rails
   pg
   puma
+  rackup
   rails
   rails_live_reload
   rails_semantic_logger