Fix a flaky spec wrongly asserting array order

Signed-off-by: Rémy Coutable <remy@rymai.me>

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

@@ -141,7 +141,7 @@ describe Gitlab::ImportExport::Group::LegacyTreeRestorer do
         let(:filepath) { "group_exports/visibility_levels/#{visibility_level}" }
 
         it "imports all subgroups as #{visibility_level}" do
-          expect(group.children.map(&:visibility_level)).to eq(expected_visibilities)
+          expect(group.children.map(&:visibility_level)).to match_array(expected_visibilities)
         end
       end
     end