Fix the interface of PopulateVulnerabilityHistoricalStatistics#perform

lib/gitlab/background_migration/populate_vulnerability_historical_statistics.rb

@@ -5,7 +5,7 @@ module Gitlab
     # This class creates/updates those project historical vulnerability statistics
     # that haven't been created nor initialized. It should only be executed in EE.
     class PopulateVulnerabilityHistoricalStatistics
-      def perform(project_ids)
+      def perform(project_ids, retention_period = 90)
       end
     end
   end