Fix lint

Author: esrakartalOpt

spec/config/datafile_project_config_spec.rb

@@ -1286,7 +1286,7 @@
 
     it 'debug test data' do
       puts '=== DEBUG INFO ==='
-      puts 'Holdouts: #{config_with_holdouts.holdouts.inspect}'
+      puts "Holdouts: #{config_with_holdouts.holdouts.inspect}"
       puts "Global holdouts: #{config_with_holdouts.global_holdouts.inspect}"
       puts "Included holdouts: #{config_with_holdouts.included_holdouts.inspect}"
       puts "Excluded holdouts: #{config_with_holdouts.excluded_holdouts.inspect}"