Fix implicitly nullable parameter (#690)

Starting PHP 8.4, implicitly nullable parameter will trigger a deprecated message. And will remove the support in PHP 9 per RFC https://wiki.php.net/rfc/deprecate-implicitly-nullable-types

Author: RazeSoldier

src/Checkers/User/UserDefaultChecker.php

@@ -227,7 +227,7 @@ private function hidrateRole(string $class, Model|array $data): Role
     /**
      * Check if a role or permission is added to the user in a same team.
      */
-    private function isInSameTeam($rolePermission, int|string $teamId = null): bool
+    private function isInSameTeam($rolePermission, int|string|null $teamId = null): bool
     {
         if (
             ! Config::get('laratrust.teams.enabled')

src/Contracts/Role.php

@@ -53,5 +53,5 @@ public function givePermissions(iterable $permissions): static;
     /**
      * Detach multiple permissions from current role.
      */
-    public function removePermissions(iterable $permissions = null): static;
+    public function removePermissions(?iterable $permissions = null): static;
 }

src/Models/Role.php

@@ -152,7 +152,7 @@ public function givePermissions(iterable $permissions): static
         return $this;
     }
 
-    public function removePermissions(iterable $permissions = null): static
+    public function removePermissions(?iterable $permissions = null): static
     {
         if (! $permissions) {
             $this->syncPermissions([]);