Fix PHPUnit test warning for missing class

Renamed the permissions client test file so the filename matches the class name, eliminating PHPUnit’s “Class … cannot be found” warning

Author: KroderDev

tests/Services/PermissionClientTest.php renamed to tests/Services/PermissionsClientTest.php

@@ -64,6 +64,6 @@ public function retrieves_access_for_any_user_model()
 
         $this->assertEquals(['admin'], $access['roles']);
         $this->assertEquals(['edit.posts'], $access['permissions']);
-        $this->assertSame('/auth/permissions/5', $this->gateway->getCalls()[0]['uri']);
+        $this->assertSame('/permissions/5', $this->gateway->getCalls()[0]['uri']);
     }
 }