Fix deprecated notice:

Since symfony/http-foundation 5.1: Retrieving a non-scalar value from "Symfony\Component\HttpFoundation\InputBag::get()" is deprecated, and will throw a "Symfony\Component\HttpFoundation\Exception\BadRequestException" exception in Symfony 6.0, use "Symfony\Component\HttpFoundation\InputBag::all($key)" instead.

src/WpStarter/Http/Concerns/InteractsWithInput.php

@@ -7,6 +7,7 @@
 use WpStarter\Support\Facades\Date;
 use SplFileInfo;
 use stdClass;
+use Symfony\Component\HttpFoundation\InputBag;
 use Symfony\Component\VarDumper\VarDumper;
 
 trait InteractsWithInput
@@ -507,6 +508,10 @@ protected function retrieveItem($source, $key, $default)
             return $this->$source->all();
         }
 
+        if ($this->$source instanceof InputBag) {
+            return $this->$source->all()[$key] ?? $default;
+        }
+
         return $this->$source->get($key, $default);
     }