Update rename_base.rb

lib/gitlab/database/rename_reserved_paths_migration/v1/rename_base.rb

@@ -15,7 +15,7 @@ module Gitlab
           end
 
           def path_patterns
-            @path_patterns ||= paths.map { |path| ["%/#{path}", "#{path}"] }.flatten
+            @path_patterns ||= paths.flat_map { |path| ["%/#{path}", path] }
           end
 
           def rename_path_for_routable(routable)