fix: add eloquent-power-joins dependency

The package was already in use via Filament but was missing from the
composer.json require section. This caused CI failures when tests
tried to sort table columns by relationships using orderByPowerJoins().

Fixes #5

Author: ManukMinasyan

composer.json

@@ -40,6 +40,7 @@
     "require": {
         "php": "^8.3",
         "filament/filament": "^4.0",
+        "kirschbaum-development/eloquent-power-joins": "^4.0",
         "spatie/laravel-package-tools": "^1.15.0",
         "spatie/laravel-data": "^4.0.0",
         "postare/blade-mdi": "^1.0"