Add morphToMany to be able to use with relation sort

[Samuell1]

This pull request makes a small update to the defineSortableRelations method in src/Database/Traits/SortableRelation.php to improve support for relation types. The change adds morphToMany to the list of relation types that interact with pivot tables.

• Added morphToMany to the $interactsWithPivot array to ensure sortable relations work correctly for both belongsToMany and morphToMany relationships.

[Copilot]

Pull Request Overview

This PR extends the sortable relations functionality to support polymorphic many-to-many relationships by adding morphToMany to the list of relation types that interact with pivot tables.

• Added morphToMany to the $interactsWithPivot array alongside belongsToMany

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[daftspunk]

Thanks!