Refactor phpstan errors.

app/Repositories/UserGroups/Budget/AvailableBudgetRepositoryInterface.php

@@ -26,12 +26,19 @@ declare(strict_types=1);
 namespace FireflyIII\Repositories\UserGroups\Budget;
 
 use Carbon\Carbon;
+use FireflyIII\User;
 
 /**
  * Interface AvailableBudgetRepositoryInterface
  */
 interface AvailableBudgetRepositoryInterface
 {
+    /**
+     * @param User $user
+     *
+     * @return void
+     */
+    public function setUser(User $user): void;
     /**
      * @param Carbon $start
      * @param Carbon $end