[12.x] Fix Session's getCookieExpirationDate incompatibility with C…

…arbon 3 (#54313)

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

src/Illuminate/Session/Middleware/StartSession.php

@@ -266,7 +266,7 @@ protected function getCookieExpirationDate()
         $config = $this->manager->getSessionConfig();
 
         return $config['expire_on_close'] ? 0 : Date::instance(
-            Carbon::now()->addMinutes($config['lifetime'])
+            Carbon::now()->addMinutes((int) $config['lifetime'])
         );
     }