test: suppress warnings due to unused variables

test/entt/entity/registry.cpp

@@ -1356,8 +1356,8 @@ TEST(Registry, NestedGroups) {
 ENTT_DEBUG_TEST(Registry, ConflictingGroups) {
     entt::registry registry;
 
-    [[maybe_unused]] auto group = registry.group<char>(entt::get<int>, entt::exclude<double>);
-    ASSERT_DEATH(auto other = registry.group<char>(entt::get<float>, entt::exclude<double>), "");
+    registry.group<char>(entt::get<int>, entt::exclude<double>);
+    ASSERT_DEATH(registry.group<char>(entt::get<float>, entt::exclude<double>), "");
 }
 
 TEST(Registry, SortSingle) {