Fix type definition for ActionDispatch::Routing::RouteSet#url_helpers (#935)

Author: nissy325

gems/actionpack/6.0/actiondispatch.rbs

@@ -73,7 +73,7 @@ module ActionDispatch
 
       def url_helpers: (?bool supports_path) -> RouteSet_AnonymousModule
 
-      class RouteSet_AnonymousModule
+      module RouteSet_AnonymousModule
         include ActiveSupport::Concern
         include UrlFor
         # https://github.com/rails/rails/blob/v6.0.6.1/actionpack/lib/action_dispatch/routing/route_set.rb#L478

gems/actionpack/7.2/actiondispatch.rbs

@@ -73,7 +73,7 @@ module ActionDispatch
 
       def url_helpers: (?bool supports_path) -> RouteSet_AnonymousModule
 
-      class RouteSet_AnonymousModule
+      module RouteSet_AnonymousModule
         include ActiveSupport::Concern
         include UrlFor
         # https://github.com/rails/rails/blob/v7.2.2.2/actionpack/lib/action_dispatch/routing/route_set.rb#L518