Here are some recommendations for laptops that should be able to handle your tasks:
Acer Aspire 5 - This laptop has an 8th generation Intel Core i5 processor and 8GB of RAM, which should be enough to run Spine and Unity. It also has a Full HD display and a 256GB solid-state drive, which will help with performance.
Lenovo IdeaPad 3 - This laptop has a 10th generation Intel Core i3 processor and 4GB of RAM, which should be sufficient for running Spine and Unity. It also has a Full HD display and a 128GB solid-state drive.
HP Pavilion x360 - This laptop has an 8th generation Intel Core i5 processor and 8GB of RAM, which should be enough for running Spine and Unity. It also has a Full HD display and a 256GB solid-state drive.