Remove patch from labkit_middleware.rb

config/initializers/labkit_middleware.rb

@@ -3,22 +3,6 @@
 # partial backport of https://github.com/rails/rails/pull/38169
 # this is in order to be able to re-order rack middlewares.
 
-if ActionDispatch::MiddlewareStack.method_defined?(:move)
-  warn "`move` is now defined in in ActionDispatch itself: https://github.com/rails/rails/pull/38169, please remove this patch from #{__FILE__}"
-else
-  module ActionDispatch
-    class MiddlewareStack
-      def move(target, source)
-        source_index = assert_index(source, :before)
-        source_middleware = middlewares.delete_at(source_index)
-
-        target_index = assert_index(target, :before)
-        middlewares.insert(target_index, source_middleware)
-      end
-    end
-  end
-end
-
 unless Rails::Configuration::MiddlewareStackProxy.method_defined?(:move)
   module Rails
     module Configuration