Laravel 9 Update (#1413)

Update to Laravel 9 and PHP 8+

Co-authored-by: B.Fatih KOZ <fatih.koz@gmail.com>

app/Http/Controllers/Admin/ExpenseController.php

@@ -20,9 +20,9 @@ class ExpenseController extends Controller
 {
     use Importable;
 
-    private $airlineRepo;
-    private $expenseRepo;
-    private $importSvc;
+    private AirlineRepository $airlineRepo;
+    private ExpenseRepository $expenseRepo;
+    private ImportService $importSvc;
 
     /**
      * expensesController constructor.