Merge branch '6.0' into 6.1

* 6.0:
  [HttpFoundation] IPv4-mapped IPv6 addresses incorrectly rejected
  Minor (comment only), part 2
  [RateLimiter] Add typecast to Reservation::wait
  [FrameworkBundle] Remove check of undefined service in mailer assertions
  [VarDumper] Ignore \Error in __debugInfo()

Author: nicolas-grekas

Test/MailerAssertionsTrait.php

@@ -123,10 +123,6 @@ private static function getMessageMailerEvents(): MessageEvents
             return $container->get('mailer.message_logger_listener')->getEvents();
         }
 
-        if ($container->has('mailer.logger_message_listener')) {
-            return $container->get('mailer.logger_message_listener')->getEvents();
-        }
-
         static::fail('A client must have Mailer enabled to make email assertions. Did you forget to require symfony/mailer?');
     }
 }