Align argument type to keyword argument for private process method in FetchResourceService (#25189)

app/services/fetch_resource_service.rb

@@ -19,7 +19,7 @@ class FetchResourceService < BaseService
 
   private
 
-  def process(url, terminal = false)
+  def process(url, terminal: false)
     @url = url
 
     perform_request { |response| process_response(response, terminal) }