[11.x] Fixes Illuminate\Http\Response to output empty string if $content is set to null (#53872)

* [11.x] Fixes `Illuminate\Http\Response` to output empty string if
`$content` is set to `null`

1. Symfony set the content to `null` for `response()->noContent()` https://github.com/symfony/http-foundation/blob/e88a66c3997859532bc2ddd6dd8f35aba2711744/Response.php#L246-L249
2. This cause issue with PSR-7 HTTP Stream in Octane

fixed laravel/octane#972

Signed-off-by: Mior Muhammad Zaki <[email protected]>

* wip

Signed-off-by: Mior Muhammad Zaki <[email protected]>

* wip

Signed-off-by: Mior Muhammad Zaki <[email protected]>

* Update Response.php

* Update Response.php

---------

Signed-off-by: Mior Muhammad Zaki <[email protected]>
Co-authored-by: Taylor Otwell <[email protected]>

Author: crynobone

src/Illuminate/Http/Response.php

@@ -37,6 +37,15 @@ public function __construct($content = '', $status = 200, array $headers = [])
         $this->setProtocolVersion('1.0');
     }
 
+    /**
+     * Get the response content.
+     */
+    #[\Override]
+    public function getContent(): string|false
+    {
+        return transform(parent::getContent(), fn ($content) => $content, '');
+    }
+
     /**
      * Set the content on the response.
      *