Fix call signature

Author: rmosolgo

lib/graphql/execution/next/field_resolve_step.rb

@@ -54,14 +54,14 @@ def coerce_arguments(argument_owner, ast_arguments_or_hash, run_loads = true)
             return EmptyObjects::EMPTY_HASH
           end
           args_hash = {}
-          
+
           if ast_arguments_or_hash.nil? # This can happen with `.trigger`
             return args_hash
           end
 
           arg_inputs_are_h = ast_arguments_or_hash.is_a?(Hash)
 
-          arg_defns.each do |arg_graphql_name, arg_defn|
+          arg_defns.each do |arg_defn|
             arg_value = nil
             was_found = false
             if arg_inputs_are_h