Upgrade to Laravel 9 (#4413)

Co-authored-by: DaneEveritt <dane@daneeveritt.com>

tests/Integration/Api/Client/Server/Subuser/SubuserAuthorizationTest.php

@@ -50,9 +50,6 @@ class SubuserAuthorizationTest extends ClientApiIntegrationTestCase
         $this->actingAs($user)->json($method, $this->link($server3, '/users/' . $internal->uuid))->assertNotFound();
     }
 
-    /**
-     * @return \string[][]
-     */
     public function methodDataProvider(): array
     {
         return [['GET'], ['POST'], ['DELETE']];