fix(union func): fix for pagination

[FannyDevz]

change from ['orders', 'limit', 'offset'] to ['unionOrders', 'unionLimit', 'unionOffset']

[github-actions]

Thank you for your pull request. However, you have submitted this PR on the Illuminate organization which is a read-only sub split of laravel/framework. Please submit your PR on the https://github.com/laravel/framework repository.

Thanks!