Fix Security/IoMethods offenses

.rubocop_todo/security/io_methods.yml

ee/lib/tasks/gitlab/spdx.rake

ee/spec/factories/spdx_catalogue.rb

...b/ee/gitlab/import_export/group/legacy_tree_saver_spec.rb

ee/spec/lib/gitlab/spdx/catalogue_spec.rb

lib/gitlab/import_export/json/legacy_reader.rb

lib/gitlab/import_export/lfs_restorer.rb

lib/tasks/gitlab/assets.rake

spec/features/projects/import_export/export_file_spec.rb

spec/lib/backup/gitaly_backup_spec.rb

...b/gitlab/import_export/group/legacy_tree_restorer_spec.rb

.../lib/gitlab/import_export/group/legacy_tree_saver_spec.rb

spec/lib/gitlab/import_export/group/tree_restorer_spec.rb

spec/lib/gitlab/import_export/import_test_coverage_spec.rb

spec/lib/gitlab/import_export/json/legacy_writer_spec.rb

spec/lib/gitlab/import_export/lfs_saver_spec.rb

spec/lib/gitlab/import_export/project/relation_saver_spec.rb

spec/support/helpers/gitaly_setup.rb

spec/support/import_export/common_util.rb